The structure of methyl silatrane (1-methyl-2,8,9-trioxa-5-aza-1-silabicyclo(3.3.3)undecane) as determined by gas phase electron diffraction

The structure of methyl silatrane is investigated by gas-phase electron diffraction at 185° C. The molecule possesses C_3v symmetry. The result obtained for the Si—N distance (2.45(5) Å) indicates essentially no dative bonding between Si and N in the gas phase. This result is quite different from the solid-state result which indicates a Si←N dative bond length of 2.175(4) Å. Other structural parameters compare favorably with both the solid state results and with values obtained in the gas phase for similar molecules.     

1-酰氧(胺)-2,8,9-三氧杂-5-氮杂-1-锡杂三环[3.3.3.01.5]十一烷的合成和结构研究

合成了１４个新化合物：１－酰氧（胺）基－２，８，９－三氧杂－５－氮杂－１－锡杂三环［３．３．３．０１．５］十一烷．由ＩＲ、１ＨＮＭＲ、１３ＣＮＭＲ和１１９ＳｎＮＭＲ及元素分析确定其结构．该类化合物在ＣＤＣｌ３中可能形成六配位化合物，而在ＤＭＳＯ中，溶剂分子参与Ｓｎ原子配位，聚合体解聚为六配位化合物．     

具有生物活性的有机硅化合物的研究IX:1-(N-芳基呋喃甲酰胺)亚甲基-2,8,9-三氧杂-5-氮杂-1-硅杂三环[3.3.3.O^1^.^5]十一烷的合成

本文合成了六个1-(N-芳基呋喃甲酰胺)亚甲基-2,8,9-三氧杂-5-氮杂-1-硅杂三环[3.3.3.O^1^.^5]十一烷的化合物。合成方法简便, 反应时间短。易于后处理。经元素分析, IR, ^1H NMR, MS确定了新化合物的结构, 并经化合物3的X射线晶格衍射分析确定了该类化合物的空间排布情况。     

Crystal and molecular structure of 1-aza-5-stanna-5-chlorotricyclo[3.3.3.0]undecane, a 2,8,9-tricarbastannatrane

1-Aza-5-stanna-5-chlorotricyclo[3.3.3.0]undecane crystallizes in the space group P6₃. The unit cell, with a 8.435(3), c 9.243(2) Å, V 569.5(3) ų, contains two molecules. The structure was refined to a final R value of 0.057. The molecules CISn(CH₂CH₂CH₂)₃N belong to the point group 3, and the Sn, Cl and N atoms lie on the crystallographic 3-axis. The tin atom has a trigonal bipyramidal environment with the nitrogen and chlorine atoms in apical positions. The tin-nitrogen intramolecular interaction is 2.372(29) Å.     

1-Trimethoxysilylmethyl-and 1-(2,8,9-trioxa-5-aza-1-silabicyclo[3.3.3]undecan-1-ylmethyl)-1,1-dimethyl-2-(3-alkoxy-3-oxopropyl)hydrazinium halides

Previously unknown 1,1-dimethyl-1-trimethoxysilylmethyl-2-(3-alkoxy-3-oxopropyl)hydrazinium and 1,1-dimethyl-1-(2,8,9-trioxa-5-aza-1-silabicyclo[3.3.3]undecan-1-ylmethyl)-2-(3-alkoxy-3-oxopropyl)-hydrazinium halides were synthesized, and physiological activity of 2-(3-ethoxy-3-oxopropyl)-1,1-dimethyl-1-(2,8,9-trioxa-5-aza-1-silabicyclo[3.3.3]undecan-1-ylmethyl)hydrazinium chloride and bromide was studied.     

Synthesis, characterization and crystal structures of the boratranes: 2,10,11-trioxa-6-aza-1-boratricyclo[4.4.4.0] tetradecane (tri-n-propanolamine borate), and 3-(4-methoxy)phenoxymethyl-7,10-dimethyl-2,8,9-trioxa-5-aza-1-boratricyclo[3.3.3.0]-undecane

The crystal structures of boratranes 2,10,11-trioxa-6-aza-1-boratricyclo[4.4.4.0^1,6] tetradecane (tri-n-propanolamine borate) 1 as the tri-hydrate, and 3-(4-methoxy)phenoxymethyl-7,10-dimethyl-2,8,9-trioxa-5-aza-1-boratricyclo[3.3.3.0^1,5]-undecane 2 as the partial (0.2) hydrate have been determined. Compound 1 has a near-tetrahedral coordination of both the N (108.8°) and B atoms (111.2°), N → B bond length 1.656 Å and all-chair tricyclic conformation, whereas 2 has a slightly-longer N → B dative bond length (1.667 Å) and the O-B-O angle, 114.8°, was slightly distorted from near-tetrahedral to adopt a flatter conformation. Theoretical calculations on 1 and 2 showed that the B-N distance in each shortened markedly between isolated gas phase molecules and ‘solvated’ models. Neither structural results, nor calculated parameters, were able to explain the propensity towards slow hydrolysis of boratranes with five-membered rings compared with the relative hydrolytic stability of boratranes with six-membered rings.     

1-酰氧基-2,8,9-三氧杂-5-氮杂-1-锗杂三环[3,3,3,O~(1,5)]十-碳烷的合成和结构研究

1-氯代杂氮锗三环与羧酸钾盐反应生成1-酰氧基杂氮锗三环化合物。通过IR，1HNMR和质谱确定了它们的结构。测定了化合物SCH＝CHCHC－COOGe（OCH2CH2）3N的晶体结构，化合物为五配位，N→Ge键长为0．212nm。     

1-Aza-5-stanna-5,5-dimethylbicyclo[3.3.01,5] octan und 1-aza-5-stanna-5-methyltricyclo[3.3.3.01,5] undecan,pentakoordinierte tetraorganozinnverbindungen

The synthesis of Me₂Sn(CH₂CH₂CH₂)₂NMe and MeSn(CH₂CH₂CH₂)₃N is reported. The transannular SnN interaction is confirmed by ¹H, ¹³C and ¹¹⁹Sn NMR spectroscopy.     

杂氮钛三环的合成

本文报道了具有N→Ti配位键的2,8,9-三氧杂-5-氮杂-1-钛杂三环[3.3.3.0~(1,5)]十一碳烷的合成及其性质。共制得六个新的化合物。研究了制备它们的最佳条件及化学稳定性。     

Nuclear magnetic resonance spectra of some 2,6-disubstituted spiro[3.3]heptane derivatives

Analysis of the full splitting pattern of the 100 MHz ¹H-NMR spectra of diethyl - 2,6 -dibromospiro[3.3]heptane - 2,6 - dicarboxylate (3) in chloroform and benzene and the 220 MHz ¹H-NMR spectrum of dimethylspiro[3.3]heptane - 2,6 - dicarboxylate (2) in naphthalene has been carried out. Puckering of the cyclobutane rings is revealed. Reasonable agreement with an X-ray study on Fecht acid (1) and with the data from the ¹C-NMR spectra of compounds 2 and 3 has been obtained. The temperature dependency of the ¹H-NMR spectra of 2, 3 and the symmetrically substituted tetraethylspiro[3.3]heptane - 2,2,6,6 - tetracarboxylate (4) has been investigated and is discussed in terms of conformational interconversion.     

1-(取代硅基甲硫基)甲基-2,8,9-三氧杂-5-氮杂-1-硅杂双环[3.3.3]十一烷的合成与生物活性

2,8,9一三氧杂一5一氮杂司一硅杂双环［3．3．3」十一烷（Silatrane）衍生物是一类具有广泛生物活性的五配位有机硅化合物,自6O年代发现以来一直引起人们浓厚的兴趣,随着其1位硅原子上所连基团的变化,该类化合物可表现出通然不同的生物活性［’j．为寻找新的生物活性物质,本文在Silatranel位引入一类含硅甲硫醚基团,合成了11种新的Silatrane衍生物,并初步测定了其在农药、医药方面的生物活性;同时,在其质谱中发现存在罕见的重排裂解过程．合成方法如下：回实验部分1．l仪器与试剂BrukerAC－PZOO型NMR仪,CDCI。为溶剂,TM…     

2,8,9-Trioxa-5-aza-1-sila-bicyclo[3.3.3]undecan-3-one,ein neuer typ von silatranen; darstellung und eigenschaften

A new type of silatranes (2,8,9-trioxa-5-aza-1-silabicyclo[3.3.3] undecan-3-ones) has been prepared by reaction of organotrimethoxysilanes with N-bis(2-hydroxyethyl)aminoacetic acid.The solvolytic stability compared with that of simple acyloxysilanes, the extremely decreased basicity of nitrogen and the NMR spectra prove the pentacoordination of silicon in these compounds. Basicity and NMR data are substituent-dependent.     

Synthesis of triethylammonium l,4-diphenyl-3-o-hydroxyphenyl-2,8,9-trioxa-1-borata-4-phospha-6,7-benzenobicyclo[3.3.1]nonane

Conclusions The reaction of phenylphosphine with salicylaldehyde and phenylboric acid anhydride in the presence of triethylamine proceeds with the formation of triethylammonium 1,4-diphenyl-3-o-hydroxypheny1-2,8,9-trioxa-1-borata-4-phospha-6,7-benzenobicyclo[3.3.1]nonane.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2118–2120, September, 1987.     

SYNTHESIS OF 1-(O,O-DIALKYLPHOSPHORYLAMIDO)PROPYL-5-AZA-2,8,9-TRIOXA-1 SILATRICYCLO-[3,3,3,01,5] UNDECANES

Ten 1-(O,O-dialkyl phosphorylamido)propyl-5-aza-2,8,9-trioxa-1-silatricyclo [3,3,3,0^1,5] undecanes were synthesized by the reaction of dialkoxy phosphoryl chlorides with aminopropyl silatrane and their structures were established by elemental analysis, IR, ¹HNMR, and MS measurement. The suitable reaction conditions are discussed based on the related reaction mechanism.     

Crystal structure of 1-[N-2-aminoethyl)-aminopropyl]silatrane

The crystal structure of 1-[N-(2-aminoethyl)aminopropyl]silatrane has been determined by x-ray diffraction at room temperature. The Si←N bond distance (2.165(2) Å) is in the range observed for other 1-X-propylsilatranes (X = CN, OH, SH, Cl and SCN). The structure is partially disordered: the silatrane moiety displays a disorder that is typical for silatranes and the aminoethyl group terminating the planar chain linked to silicon is rotationally disordered.     

Molecular and crystal structure of triethylammonium 6,7-benzo-3-ortho-hydroxyphenyl-1, 4-diphenyl-2,8,9-trioxa-4-phospha-1-boratabicyclo[3.3.1]nonane

A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan' Branch, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 31, No. 2, pp. 194–197, March–April, 1990.     

Nuclear magnetic resonance study of the ferroelastic phase transition of order-disorder type in [N(C2H5)4]2CdCl4

This study uses nuclear magnetic resonance (NMR) techniques to examine the detailed changes in [N(C₂H₅)₄]₂CdCl₄ around its phase transition at the temperature T_C = 284 K. The chemical shifts and spin-lattice relaxation times in the rotating frame (T_1ρ) were determined from ¹H magic angle spinning (MAS) NMR and ¹³C cross-polarization (CP)/MAS NMR spectra. The two sets of inequivalent ¹H and ¹³C nuclei in CH₃ and CH₂ were distinguished. A ferroelastic phase transition was observed at T_C, without structural symmetry change. The phase transition is mainly attributed to the orientational ordering of the [N(C₂H₅)₄]⁺ cations, and the spectral splitting at low temperature is associated with different ferroelastic domains.