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Reformatsky reaction of methyl 1-bromocyclobutane-, 1-bromocyclopentane-, 1-bromocyclohexane-, and 1-bromocycloheptanecarboxylates with 2,5-bis(arylmethylidene)cyclopentanones gave the corresponding 4??-aryl-7??-arylmethylidene-4??,5??,6??,7??-tetrahydro-2??H-spiro[cycloalkane-1,3-cyclopenta[b]pyran]-2??-ones.  相似文献   
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The solubility in the water-salt quaternary reciprocal system Na2Cr2O7 + 2NH4Cl ⇆ (NH4)2Cr2O7 + 2NaCl-H2O has been investigated for the first time at 25, 50, and 75°C. Using a formal analytical model, the boundaries of the phase fields have been determined, and the univariant lines and invariant points have been calculated. The experimental data have been used to calculate the temperature and concentration parameters of the circular isohydric process of potassium dichromate preparation with the participation of ammonium salts as intermediates.  相似文献   
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Methyl 1-bromocyclopentane-, 1-bromocyclohexane-, and 1-bromocycloheptanecarboxylates react with zinc and 2,6-bis(arylmethylene)cyclohexanones to afford 4-aryl-8-(arylmethylene)-5,6,7,8-tetrahydrospiro[chromene-3,1′-cyclopentan]-2(4H)-ones, 4-aryl-8-(arylmethylene)-5,6,7,8-tetrahydrospiro[chromene-3,1′-cyclohexan]-2(4H)-ones, and 4-aryl-8-(arylmethylene)-5,6,7,8-tetrahydrospiro[chromene-3,1′-cycloheptan]-2(4H)-ones, respectively.  相似文献   
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Russian Chemical Bulletin - New D-π-A-type chromophores that simultaneously incorporate N,N-dimethylaminophenyl moiety as the terminal electron-donating group and either...  相似文献   
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Physicochemical properties of 4,5-(aryl, alkyl)-3-substituted 2-sulfonylaminothiophenes have been studied. The effect of the nature of the substituents in the thiophene ring on acid-base properties, solubility, and chemical stability was investigated.  相似文献   
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Russian Chemical Bulletin - New N, N′-bis(4,6-dimethylpyrimidin-2-yl)- and N, N′-bis(2,3,5,6-tetrafluorophenyl)-substituted pyromellitic diimides were synthesized. Their properties were...  相似文献   
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Russian Chemical Bulletin - Two series of new N-{4,6-bis[2-(het)arylvinyl]pyrimidin-2-yl}-substituted aromatic polycyclic imides were synthesized. The synthesized chromophores were characterized by...  相似文献   
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