Process for preparation of allyl sulfone derivatives and intermediates for the preparation
申请人:——
公开号:US20040054233A1
公开(公告)日:2004-03-18
The present invention relates to a process for producing an allyl sulfone derivative represented by the formula (3):
1
wherein Ar is an optionally substituted aryl group, and the corrugated line means either one of E/Z geometrical isomers, or a mixture thereof, which is an intermediate for producing vitamin A, which process is characterized by reacting an aryl sulfinic acid or a salt thereof represented by the formula (2):
ArSO
2
M (2)
wherein Ar is as defined above, and M is hydrogen atom, sodium atom or potassium atom, with an allyl halide derivative represented by the formula (1):
2
wherein X is a halogen atom, and Ar and the corrugated line are as defined above.
Dihalo-compound and process for producing vitamin A derivative
申请人:——
公开号:US20010025127A1
公开(公告)日:2001-09-27
There is disclosed a dihalo-compound of formula (1):
1
wherein X
1
and X
2
represent different halogen atoms, R represents a hydrogen atom or a protective group for a hydroxyl group, and a process for producing vitamin A derivative via a sulfone derivative of formula (5):
2
wherein Ar represents an optionally substituted aryl group, and R represents the same as defined above.
NOVEL SULFONE DERIVATIVES AND PROCESS FOR PRODUCING THESE
申请人:SUMITOMO CHEMICAL COMPANY LIMITED
公开号:EP1359143A1
公开(公告)日:2003-11-05
There are provided production processes for cyclic sulfone compounds of formula (2) or (4):
or
wherein the dashed lines represent that a double bond is present at one of three positions indicated; Ar and the wavy line are as defined below, characterized in that compounds of formula (1) or (3):
or
wherein Ar is aryl optionally having a substituent(s) and the wavy line represents either one of E/Z geometrical isomers or their mixture, is subjected to cyclization in the presence of an acid catalyst. These processes are excellent processes as the production processes for retinol from the viewpoints of raw material costs, intermediate purification, the number of steps, and the like.
Polymerizable composition, optical material comprising the composition and method for producing the material
申请人:——
公开号:US20040254258A1
公开(公告)日:2004-12-16
A cured matter obtained by polymerizing and curing a polymerizable composition comprising a compound having at least one episulfide in a molecule is reduced in an odor by adding a perfume to the polymerizable composition comprising the compound having at least one episulfide in a molecule.
A cloudiness of the lens is removed by raising a purity of sulfur to 98% or more.
A reduction in a chlorine content of the sulfur compound described above to 0.1% by weight or less elevates an oxidation resistance and a light fastness of the high refractive index optical material and improves a color tone thereof.
An optical product having a high refractive index and a high-degree transparency is provided by subjecting the composition in advance to deaerating treatment at 0 to 100° C. for one minute to 24 hours under a reduced pressure of 0.001 to 50 torr.
Vitamin A related compounds and process for producing the same
申请人:Sumitomo Chemical Company, Limited
公开号:EP0900785A2
公开(公告)日:1999-03-10
There is provided a compound of the formula[I]:
wherein R represents a hydrogen atom or a protective group for a hydroxyl group; and
A represents a hydrogen atom, a halogen atom or a group of the formula A1:
Q represents Q1, Q2 or Q3:
or Q4:
wherein R2 represents a hydrogen atom or a protective group for a hydroxyl group.
提供了一种式[I]化合物:
其中 R 代表氢原子或羟基的保护基团;以及
A 代表氢原子、卤素原子或式 A1 的基团:
Q 代表 Q1、Q2 或 Q3:
或 Q4:
其中 R2 代表氢原子或羟基的保护基团。