Hindered organoboron groups in organic chemistry. 25. The condensation of aliphatic aldehydes with dimesitylboryl stabilised carbanions to give alkenes.
作者:Andrew Pelter、Keith Smith、Said M.A. Elgendy
DOI:10.1016/s0040-4020(01)87983-7
日期:1993.8
In the presence of protic acids the condensation of aliphatic aldehydes with dimesitylboryl stabilised carbanions results in alkenes. In the presence of strong acids such as HCl or CF3SO3H, the products contain > 90% of E-alkenes in all cases tried. When acetic acid is used, then Z-alkenes may result predominantly, particularly in the cases of RsCHO and RtCHO. HX HCI, CF3SO3H gives E - alkenes in
在质子酸的存在下,脂族醛与二聚三苯甲基稳定的碳负离子的缩合会生成烯烃。在强酸(例如HCl或CF 3 SO 3 H)的存在下,在所有尝试的情况下,产品均含有> 90%的E-烯烃。当使用乙酸时,则可能主要产生Z-烯烃,特别是在R s CHO和R t CHO的情况下。在所有情况下,HXHCl,CF 3 SO 3 H均会生成E-烯烃。HXCH 3 CO 2 H,使得主要ž -烯烃当Rř秒,R叔。
Symmetrische alkene über episulfone aus primären sulfonylchloriden
作者:Günter Opitz、Thomas Ehlis、Karlheinz Rieth
DOI:10.1016/s0040-4039(00)99182-2
日期:——
Primary sulfonyl chlorides RCH2SO2Cl(R= Alk or Ar) react with triethylamine in acetonitrile solution at −40°C to give mixtures of cis- and trans-2,3-disubstituted thiirane-1,1-dioxides which can be thermolyzed to the corresponding Z- and E-alkenes.
伯磺酰氯RCH 2 SO 2 Cl(R = Alk或Ar)在乙腈溶液中于-40°C与三乙胺反应,制得顺式和反式-2,3-二取代的噻喃-1,1-二氧化物的混合物,可以是热解为相应的Z和E烯烃。
Hindered organoboron groups in organic chemistry. 24. The condensation of aliphatic aldehydes with dimesitylboron stabilised carbanions to give ketones.
作者:Andrew Pelter、Keith Smith、Said M.A. Elgendy、Martin Rowlands
DOI:10.1016/s0040-4020(01)87982-5
日期:1993.8
The condensation of boron stabilised carbanions, Mes2BCHLiR1, (R1≠H) with aliphatic aldehydes, R2CHO, followed by treatment with trifluoroacetic anhydride (TFAA) or N-chlorosuccinimide (NCS) is an unique, broadly applicable redox process that yields ketones, R1CH2COR2, directly and in high yields. The anion Mes2BCH2Li (Mes2BCHLiR1, R1H) gives high yields of alkenes, R2CHCH2 in the same conditions
INTERNAL OLEFINIC SULFONATE COMPOSITION AND CLEANSING COMPOSITION CONTAINING THE SAME
申请人:KAO CORPORATION
公开号:US20140080751A1
公开(公告)日:2014-03-20
Provided is an internal olefin sulfonate composition which is capable of exerting good foamability at the same time with foam quality, foam dissipation property, and less irritation to the skin at high levels, and a cleansing composition containing the same.
The internal olefin sulfonate composition of the present invention comprises (A) an internal olefin sulfonate having 16 carbon atoms and (B) an internal olefin sulfonate having 18 carbon atoms, wherein a mass content ratio (A/B) of component (A) to component (B) is from 75/25 to 90/10.
Provided are an internal olefin sulfonate composition which is capable of sufficiently enhancing foamability, foam spreadability, and foam dissipation property, and a cleansing composition containing the same. The internal olefin sulfonate composition comprises (A) an internal olefin sulfonate having 16 carbon atoms and (B) an internal olefin sulfonate having 14 carbon atoms, wherein a content mass ratio of the component (A) to the component (B), (A/B), is from 10/90 to 70/30, and a content of the internal olefin sulfonate having 18 or more carbon atoms is 5% by mass or less.