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1.
V. A. Osyanin E. A. Ivleva Yu. N. Klimochkin 《Chemistry of Heterocyclic Compounds》2011,47(7):901-905
On interacting 2-hydroxymethylphenols and the Lawesson's reagent 2-(4-methoxyphenyl)-4H-1,3,2-benzoxathiaphosphinine-2-sulfides
were obtained. The formation of highly reactive o-quinone methides as intermediates is proposed. 相似文献
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2, 4-Bis-(4-methoxyphenyl)-1, 3, 2, 4-dithiadiphosphetane-2, 4-disulfide [Lawesson reagent (LR)] 1 reacts with p-quinone monoimine- 2a to give the novel benzo-1,3,2-oxathiaphosphol-5-(methanesulfonamido)-2-(4-methoxyphenyl)-2-sulfide 4 . On the other hand, the reaction of 2b and 3 with LR 1 leads to the formation of the benzo- and the naphtho-1,3,2-dithiaphosphol-5 -(benzenesulfonamido)- 2- (4-methoxyphenyl) -2-sulfide 5 , 6 . Thiation of 2a , 2b , and 3 with P4S10 yields phenoxathiin derivatives 8a , 8b , and 9 , respectively. The identity of the new products is established from analytical and spectroscopic evidence. 相似文献
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《Journal of organometallic chemistry》2003,665(1-2):127-134
The reactions of a phosphavinyl Grignard reagent, [CyPC(But)MgCl(OEt2)] Cy=cyclohexyl, with a variety of main group 13, 14 and 16 mono-halide compounds have been investigated. When the Grignard reagent is reacted with bromocatecholborane the terminal phosphavinyl complex, [(C6H4O2)B{C(But)PCy}], is formed. Related terminal phosphavinyl tin and gallium complexes, [R3Sn{C(But)PCy}], R=Me or Bun and [IGa{C(But)PCy}2], have been prepared by similar routes. The reaction of the Grignard reagent with PhSeCl has afforded a new λ5,λ5-diphosphete, [{(But)CP(Cy)(SePh)}2], the mechanism of formation of which is discussed. The preparation of a phosphavinyl selenium compound, [(C8H4O2N)PC(But)(SePh)], is also described. All compounds have been spectroscopically characterised and several have been crystallographically authenticated. 相似文献
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A study of the photo-stability of 2-hydroxy-4-octyloxybenzophenone (HOBP) in the presence of possible photo-sensitizers present in polymers shows that this u.v. stabilizer is readily destroyed by them in the presence of light. HOBP is destroyed by carbonyl compounds and therefore appears to interfere with their photolysis at least partly by a sacrificial quenching process. 相似文献
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A series of sulphonated 2-hydroxybenzophenones containing 4-alkyloxy substituents of varying chain length has been synthesised and applied to wool fabrics. The higher members of the series, especially those with n-hexadecyloxy or n-octadecyloxy substituents, protect wool from photo-yellowing and photo-tendering more effectively than do the lower members. The higher members have the additional advantages that they are absorbed almost quantitatively during application and are not removed during laundering. The greater level of photo-protection provided by the higher members is unlikely to be due to their preferential location near the fibre surface, because redistribution of the absorber uniformly throughout the fibre does not reduce the level of protection. Other reasons for the observed differences in photo-protective behaviour are discussed. 相似文献
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A base-promoted one-pot tandem reaction sequence has been developed to transform electron-deficient chromone-fused dienes 1 and 1,3-dicarbonyl compounds 2 to functionalized 2-hydroxybenzophenones 3 under mild conditions. This domino process, which involves multiple reactions, including Michael addition/cyclization/elimination, serves as an efficient, economic, and eco-friendly method for the construction of diversified 2-hydroxybenzophenone scaffolds without a transition-metal catalyst and inert atmosphere. 相似文献
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Triethylamine catalyzes the reaction of 2-hydroxybenzonitrile ( 1 ) with aryl isocyanates to form the corresponding carbamates 2a-c , as well as the cyclization of the latter compounds to either 4[N-(N-arylcarbamoyl)-imino]-3-aryl-2H-1,3-benzoxazin-2-ones 4a-c , or 4-arylamino-2H-1,3-benzoxazin-2-ones 7a-c , depending on the reaction temperature. Under analogous conditions, the carbamates obtained from 1 and 2-chloroethyl isocyanate, 3-chloropropyl isocyanate and ethyl isocyanatoacetate undergo a double cyclization yielding imidazo- and pyrimido[1,2-c|1,3]benzoxazinones 13a,b,17 . Upon heating in phenyl ether, compounds 7a-c , rearrange to 2-(2-hydroxyphenyl)-4(3H)-quinazolinones 10a-c . 相似文献
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N. P. Belskaya A. V. Koksharov S. G. Lesogorova P. A. Slepukhin V. A. Bakulev 《Russian Chemical Bulletin》2011,60(5):889-895
The reactions of 2-arylhydrazono-2-carbamoylacetamidoximes with orthoesters afford either 3-arylhydrazono-1,2,4-oxadiazoles
or 1,2,3-triazoles, depending on the reactant structure. 相似文献
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The coupling reaction of water-soluble alkyl nitriles using Fenton's reagent (Fe(II) and H2O2) is described. The best metal for the reaction is iron(II), and the greatest yields are obtained when the concentration of the metal is kept low. Hydrogen-atom abstraction is selective, preferentially producing the radical alpha to the nitrile. In order to increase the production of dinitrile, in situ reduction of iron(III) to iron(II), using a variety of reducing agents, was investigated. 相似文献
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A. Ya. Strakov M. V. Petrova Ju. Popelis A. A. Krasnova N. A. Strakova 《Chemistry of Heterocyclic Compounds》1996,32(2):221-226
The reaction of 2 formyldimedone with 2-amino- and 2-hydrazinobenzimidazoles at 20°C in ethanol gave 2-(2-benzimidazolyl)aminomethylene- and 2-[2-(2-benzimidazolyl)hydrazinomethylene]-5,5-dimethylcylohex-anediones, while this reaction carried out in ethanol at reflux in the presence of acid gave 2,2-dimethyl-4-oxo 1, 2, 3, 4-tetrahydroquinazolino(1, 2-a]benzimidazole and 1-(2-benzimidazolyl)-6, 6-dimethyl-4-oxo-4, S, 6, 7-tetrahydroindazole, respectively.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 247–252, February, 1996. 相似文献
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Nineteen sulphonated 2-hydroxybenzophenones and three sulphonated 2,2′-dihydroxybenzophenones have been prepared and compared with a commercially available member of each class of uv absorber as photo-protective agents for wool. Treated fabrics were exposed to Philips ML G/74 lamps and the extent of photo-tendering was assessed by measuring breaking loads and tear strengths. In general, 2-hydroxybenzophenones with 3-alkyl substituents provide better protection against photo-tendering than absorbers lacking 3-alkyl substituents. 2,2′-Dihydroxybenzophenones are more effective than 2-hydroxybenzophenones.
On the basis of effectiveness and ease of synthesis, 2,2′-dihydroxy-4,4′-bis-w-sulphobutyloxybenzophenone (VIIb) shows most promise as a photo-protective agent. At the 5% level of application it trebles the lifetime of wool fabric during exposure to sunlight through window glass. It also retards the photo-tendering and fading of wool fabrics containing either a red or a blue milling acid dye. 相似文献
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Barskaya E. S. Beloglazkina E. K. Mazhuga A. G. Yudin I. V. Zyk N. V. 《Russian Chemical Bulletin》2015,64(8):1975-1977
Russian Chemical Bulletin - Reflux of imidazole-2-carboxaldehyde, 1-methylimidazole-2-carboxaldehyde, imidazole4-carboxaldehyde, or 5-bromopyridine-2-carboxaldehyde with 2-aminothiophenol in... 相似文献
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Artem A. Zemtsov Marina I. Struchkova Vladimir A. Tartakovsky 《Journal of fluorine chemistry》2011,132(6):378-381
The interaction of 2-nitrocinnamates with silicon reagents Me3SiRf (Rf = CF3, C2F5, and C6F5) promoted either by sodium acetate in DMF or by tetrabutylammonium acetate in dichloromethane has been described. The reactions proceed as conjugate addition of fluorinated carbanion at the CC bond and afford 3-aryl-2-nitrobutanoates bearing a fluorinated substituent in good yields as diastereomeric mixtures in ratio from 1:1 to 1.6:1. 相似文献
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R. F. Ambartsumova 《Chemistry of Heterocyclic Compounds》1999,35(10):1245-1248
Addition of 2-arylaminobenzothiazoles to the C=C bond of methyl acrylate gives a mixture of isomeric 2-arylimino-3-(β-carbomethoxyethyl)benzothiazolines
and 2-[N-aryl-N-(β-carbomethoxyethyl)amino]-benzothiazoles. Their thermal stability was studied, HPLC analysis was used to
follow the dynamics of the accumulation of the compounds formed in the reaction mixtures.
Institute for the Chemistry of Plant Materials, Uzbekistan Republic Academy of Sciences, Taskhkent 700170. Translated from
Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1428–1431, October, 1999. 相似文献
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Thiolates undergo substitution reactions with 2-substituted-2-nitropropanes by an SRN1 mechanism or are oxidised to disulphides by an ionic mechanism. 相似文献