Regiochemical control in palladium(0) and palladium(<scp>II</scp>) catalysed alkene–formate ester carbonylation reactions
作者:Ivan J. B. Lin、Howard Alper
DOI:10.1039/c39890000248
日期:——
Palladium(0) complexes [Pd(PPh3)4 or Pd(dba)2], (dba = dibenzylideneacetone) in the presence of 1,4-bis(diphenylphosphino)butane, can catalyse the reaction of alkenes and formate esters to give linear carboxylic esters as the major product, while the branched chain isomer was the principal ester obtained by use of a palladium(II) complex [bis(triphenylphosphine)palladium dichloride] as the catalyst
There is provided a curable fluorine-containing polymer composition which is quickly cured at relatively low temperatures by hydrosilylation reaction and provides a coating film which has high hardness, excellent solvent resistance and flexibility. The curable fluorine-containing polymer composition comprises a fluorine-containing polymer comprising a fluorinated ethylenic monomer unit and a non-fluorinated ethylenic monomer unit, in which a part or the whole of the non-fluorinated ethylenic monomer units is a unit represented by the formula:
wherein R
1
is hydrogen or methyl; R
2
is a hydrocarbon group having ethylenic C═C; X is —C(O)NH— or —C(O)—; R
3
is —O—, —O[CH(R
4
)]
m
O—, —(CH
2
)
m
O—, —OC(O)—(CH
2
)
m
O— or —(CH
2
)
m
OC(O)—(CH
2
)
n
O—, where R
4
is —H, —OH, —CH
2
OH or —O—X—R
2
, a siloxane compound having hydrogen atom bonded to silicon atom, and a catalyst for hydrosilylation reaction.
POLYMER
申请人:Sumitomo Chemical Company, Limited
公开号:US20180030175A1
公开(公告)日:2018-02-01
A polymer that is capable of affording a heat storage material superior in humidity permeability and shape retention after phase transition and that is superior in molding processability is provided. The polymer includes constitutional units (A) derived from ethylene, constitutional units (B) represented by a specified formula, and optionally includes constitutional units (C) represented by another specified formula. Where the total number of the units (A), the units (B), and the units (C) is 100%, the number of the units (A) accounts for 70% to 99%, the total number of the units (B) and the units (C) accounts for 1% by weight to 30% by weight. Where the total number of the units (B) and the units (C) is 100%, the number of the units (B) accounts for 1% to 100% and the number of the units (C) accounts for 0% to 99%.