The ip LD50 values for 70 silatranes tested in mice ranged from 0.15 mg/kg for silatranes (with R=4-MeC6H4) to > 3000 mg/kg for 9 of the 70 cmpd. The LD50 for silatrane (R=H) itself was 100 mg/kg. In general, cmpd with alkyl, alkenyl, and alkoxy substituents were the least toxic and those with aryl and thienyl substituents the most toxic (LD50 < 1.0 mg/kg). /Silatranes/
Experiments on rats were made to study the effect of I-(chloromethyl) silatrane and I-(ethoxy) silatrane and that of triethanolamine and chloromethyl triethoxysilane on biochemical parameters of granular-fibrose tissue. The preparations were applied to a wound defect in the form of liniments. Silatranes were found to stimulate proliferation of the cells and to increase their biosynthetic activity, to favor accumulation of collagen and non-collagenic proteins, and reduction of the inflammatory phenomena. The silicon containing fragment of the silatrane molecule chloromethyl triethoxysilane produced an analogous but less marked action. ... These data indicate that silicon entering the silatrane grouping is of great importance for the occurrence of its biological activity. /Silatranes/
Only 1-ethoxy-silatrane was hydrolyzed by the diatom (Cyclolella cryptica), giving sufficient quantities of Si(OH)4 to maintain growth without exogenous Si(OH)4. In this case the diatoms multiplied by a factor of 18 within 48 hr. With silica in the medium, 1-phenylsilatrane, 1-phenyl-3,7,10-trimethylsilatrane, 1-chloromethylsilatrane and 1-chloromethyl-3,7,10-trimethoxysilatrane exhibited only slightly inhibitory activity ... . Respiration was unaffected by all the silatranes tested, but not photosynthetic oxygen evolution was reduced ... almost completely by 1-phenylsilatrane. ... In the absence of silica as nutrient in the medium, the silatranes hardly affected dark respiration within 24 hr. Conversely, the same samples showed no photosynthetic oxygen evolution after 24 hr, and 24 hr later again a negative O2 balance was produced in the light. Different silatranes produced significant differences in the final oxygen balance.
4-Ethynyl- and 4-(prop-1-ynyl)phenylsilatranes are highly toxic to houseflies (pretreated with piperonyl butoxide) and milkweed bugs (topical LD50s 3-14 ug/g) and to mice (intraperitoneal LD50s 0.4-0.9 mg/kg).
CARBON–SILICON BOND CLEAVAGE OF ORGANOTRIALKOXYSILANES AND ORGANOSILATRANES WITHm-CHLOROPERBENZOIC ACID ANDN-BROMOSUCCINIMIDE. NEW ROUTE TO PHENOLS, PRIMARY ALCOHOLS AND BROMIDES
CARBON–SILICON BOND CLEAVAGE OF ORGANOTRIALKOXYSILANES AND ORGANOSILATRANES WITHm-CHLOROPERBENZOIC ACID ANDN-BROMOSUCCINIMIDE. NEW ROUTE TO PHENOLS, PRIMARY ALCOHOLS AND BROMIDES
(NHC)Palladium Complexes from Hydroxy-Functionalized Imidazolium Salts as Catalyst for the Microwave-Accelerated Fluorine-Free Hiyama Reaction
作者:Itziar Peñafiel、Isidro M. Pastor、Miguel Yus、Miguel A. Esteruelas、Montserrat Oliván、Enrique Oñate
DOI:10.1002/ejoc.201101110
日期:2011.12
Financial support from the Ministerio de Ciencia e Innovacion (MICINN) of Spain (Project Nos. CTQ2007-65218, CTQ2008- 00810, Consolider Ingenio 2010 CSD2007-00006), the Generalitat Valenciana (PROMETEO/2009/0349 and FEDER), the Diputacion General de Aragon (E35), and the European Social Fund is acknowledged.
Conversion of hydrosilanes to alkoxysilanes catalyzed by Cp2TiCl2/nBuLi
作者:Thomas C. Bedard、Joyce Y. Corey
DOI:10.1016/0022-328x(92)83095-y
日期:1992.5
disiloxanes and trisiloxanes in addition to cyclopolysilanes are produced when R Me. Other protic reagents including acids, mercaptans, amines and enolizable ketones did not react. The effects of reaction parameters such as temperature, silane to catalyst ratio, solvent, transition metal and replacements for nBuLi were also determined.
1-halosilatranes is discussed. Some new preparative methods based on hetero- and homo-lytic reactions of the silatrane and the Si- and C-substituted silatranes with halogenating reagents are described and also synthetic routes to 1-halosilatranes from certain organotrialkoxy- and organotrichlorosilanes. The electrophilic reactions of 1-iodosilatrane with ethers and esters, carbonylcompounds, alkoxysilanes and siloxanes
A kinetic study has been made of the reaction of some 1-organosilatranes with aqueous-methanolic hydrochloric acid. The reaction is of first-order in both silatrane and acid, and for XC6H4,-silatranes electron release by X assists the reaction. For acid catalysis in water or in water/dioxan, the rate is effectively the same irrespective of whether protium oxide or deuterium oxide is used. It is suggested
动力学研究了一些1-有机基硅烷基酯与含水甲醇盐酸的反应。该反应在甲硅烷基和酸中都是一阶的,并且对于XC 6 H 4,通过X释放的-硅烷基转移电子有助于该反应。对于在水中或在水/二恶烷中的酸催化,无论使用氧化pro还是氧化氘,该速率均有效地相同。建议确定速率的步骤涉及氮原子的质子化与SiN键的断裂协同作用,质子化在过渡态几乎完成。
Si-C-Bond cleavage in 1-organylsilatranes by bromine or iodine chloride
作者:M. G. Voronkov、V. P. Baryshok、N. F. Lazareva
DOI:10.1007/bf01457789
日期:1996.8
The Si-C bond in I-organylsilatranes is cleaved by bromine or iodine chloride to yield 1-bromo- or 1-chlorosilatrane respectively. In the presence of Et2O or THF and under the action of dioxane dibromide, I-halosilatrane