Tin(II) chloride dihydrate-mediated deacetalisation- bicyclisation procedures for the construction of novel polycyclic heterocycles from amides possessing a pendant acetal group are re- ported. Optimisation and scoping studies are described; using this methodology, a range of known, and novel, ring-fused heterocyclic systems have been prepared, some in enantiomerically pure form.
A fast and highly enantioselective brominativedearomatization of naphtholscatalyzed by diphenylamine‐linked bis(oxazoline)‐Cu(OTf)2 complexes has been developed. The corresponding products of chiral naphthalenones bearing a Br‐containing tetrasubstituted stereogenic center could be obtained with good to excellent enantioselectivities (up to 95% ee) in excellent yields (up to 97% yield) within short
A heat-sensitive recording material comprising a heat-sensitive recording layer and a protective layer on a support, wherein the protective layer contains an acetylene glycol represented by the following formula (1):
Formula (1)
1
Wherein; R
1
to R
4
respectively represents a hydrogen atom, a branched, straight-chain or cyclic unsubstituted or substituted alkyl group having 1 to 8 carbon atoms or an unsubstituted or substituted aryl group having 6 to 10 carbon atoms; R
5
to R
8
respectively represents a hydrogen atom or a methyl group; and n and m independently denotes an integer from 0 to 50.
一种热敏记录材料,包括热敏记录层和支撑体上的保护层,其中保护层含有由下式(1)表示的乙二醇:
式(1)
1
其中
1
至 R
4
分别代表氢原子、具有 1 至 8 个碳原子的支链、直链或环状未取代或取代 的烷基或具有 6 至 10 个碳原子的未取代或取代的芳基; R 5
5
至 R
8
分别代表氢原子或甲基;n 和 m 独立地表示 0 至 50 的整数。
METHOD AND COMPOSITION FOR IMPROVING GAS BARRIER PROPERTIES OF POLYMERIC CONTAINERS AND FILMS