Une méthode simple et efficace de préparation des dihydrures organotanniques
摘要:
A new and efficient method of preparation of R(2)SnH(2) is proposed. Organodioxastannolanes were used as starting materials, these compounds being easily obtained by azeotropic distillation of water from a solution of diorganotin oxides and 1,2 diols in cyclohexane. Their reduction by commercial BH3/THF complex gave raw dialkyltin dihydrides with excellent yields and high purity degrees.
DOI:
10.1016/0022-328x(94)05356-g
作为产物:
描述:
氧化二辛基锡 、 乙二醇 在
甲苯 作用下,
以
甲苯 为溶剂,
反应 30.5h,
以to give 1,1-dioctylstanna-2,5-dioxacyclopentane, 2.19 g (97.6% yield)的产率得到2,2-dioctyl-1,3-dioxa-2-stannolane
参考文献:
名称:
Process for producing &bgr;-butyrolactone homopolymer or copolymer
PROCESS FOR PRODUCING B-BUTYROLACTONE HOMOPOLYMER OR COPOLYMER
申请人:——
公开号:US20020052458A1
公开(公告)日:2002-05-02
The object of the invention is to provides a process in which a high-molecular-weight &bgr;-butyrolactone homopolymer or copolymer being biodegradable, absorbable into the living body, useful as a functional polymeric material and superior in physical characteristics is produced with high yield and good productivity. This object is solved by a process for producing the homopolymer or copolymer of the invention, which comprises ring-opening polymerization of sole &bgr;-butyrolactone subjected previously to acid removal and dehydration treatment, or of said &bgr;-butyrolactone with other lactones, in the presence of a tin compound represented by the following formula (1) and/or formula (2):
1
wherein R
1
and R
2
and R
4
to R
7
independently represent an alkyl group containing 1 to 12 carbon atoms which may have a branched chain, or a cycloalkyl group containing 5 to 7 carbon atoms, or a phenyl or naphthyl group which may have a substituent group, R
3
represents an alkylene group containing 2 to 12 carbon atoms which may have a substituent group, a cyclopentane-1,2-ylene group or a cyclohexane-1,2-ylene group, and n is an integer of 1 to 10.
Une méthode simple et efficace de préparation des dihydrures organotanniques
作者:H. Deleuze、B. Maillard
DOI:10.1016/0022-328x(94)05356-g
日期:1995.3
A new and efficient method of preparation of R(2)SnH(2) is proposed. Organodioxastannolanes were used as starting materials, these compounds being easily obtained by azeotropic distillation of water from a solution of diorganotin oxides and 1,2 diols in cyclohexane. Their reduction by commercial BH3/THF complex gave raw dialkyltin dihydrides with excellent yields and high purity degrees.
Process for producing &bgr;-butyrolactone homopolymer or copolymer
申请人:Takasago International Corporation
公开号:US06545112B2
公开(公告)日:2003-04-08
The object of the invention is to provides a process in which a high-molecular-weight &bgr;-butyrolactone homopolymer or copolymer being biodegradable, absorbable into the living body, useful as a functional polymeric material and superior in physical characteristics is produced with high yield and good productivity. This object is solved by a process for producing the homopolymer or copolymer of the invention, which comprises ring-opening polymerization of sole &bgr;-butyrolactone subjected previously to acid removal and dehydration treatment, or of said &bgr;-butyrolactone with other lactones, in the presence of a tin compound represented by the following formula (1) and/or formula (2):
wherein R1 and R2 and R4 to R7 independently represent an alkyl group containing 1 to 12 carbon atoms which may have a branched chain, or a cycloalkyl group containing 5 to 7 carbon atoms, or a phenyl or naphthyl group which may have a substituent group, R3 represents an alkylene group containing 2 to 12 carbon atoms which may have a substituent group, a cyclopentane-1,2-ylene group or a cyclohexane-1,2-ylene group, and n is an integer of 1 to 10.