摘要:
The present invention is directed to a process for synthesizing at least one levulinate ester, said process comprising the reaction of furfuryl alcohol with at least one other alcohol in the presence of water and at least one catalyst, said furfuryl alcohol being present in a quantity of a least 5%by weight, based on the total weight of the alcohols, and said catalyst comprising at least one triflate ligand and at least one metal selected from bismuth, gallium, aluminum, tin and iron.
摘要:
The present invention is directed to a process for synthesizing at least one levulinate ester, said process comprising the reaction of furfuryl alcohol with at least one other alcohol in the presence of water and at least one catalyst, said furfuryl alcohol being present in a quantity of a least 5% by weight, based on the total weight of the alcohols, and said catalyst comprising at least one metal selected from bismuth and gallium.
摘要:
A process to prepare a compound of Formula (I) wherein R 3 , R 4 and R 5 are each selected independently from hydrogen, halogen, alkyl, alkenyl, alkynyl, alkoxyl, and wherein the alkyl, alkenyl, alkynyl, and alkoxyl may be optionally substituted with one or more halogen, alkyl, alkenyl, alkynyl, and alkoxyl.
摘要:
Self-immolative polymers degrade by an end-to-end depolymerisation mechanism in response to the cleavage of a stabilizing end-cap from the polymer terminus. Examples include homopolymers, mixed polymers including block copolymers, suitable for a variety of applications. A polyglyoxylate can be end-capped or capped with a linker as in a block copolymer.
摘要:
The present invention relates to a process for the preparation of aqueous solutions of [1- 13 C]-hyperpolarized carboxylate containing molecules of diagnostic interest that comprises parahydrogenating with molecular parahydrogen unsaturated alkenyl or alkynyl esters of the concerned 13 C- carboxylate molecules.
摘要:
Compounds of the formula (I), wherein m is 1 or 2; R 1 , R 2 , R 4 and R 5 independently of one another are hydrogen, C 1 -C 4 alkyl, C 5 -C 7 cyclo-alkyl, phenyl, C 1 -C 4 alkoxy, C 5 -C 7 cycloalkoxy or phenoxy; R 3 , if m is 1, has one of the meanings as given above for R 1 , R 2 , R 4 and R 5 ; R 3 , if m is 2, is a divalent group; R 6 is hydrogen or C 1 -C 4 alkyl; R 7 is hydrogen, and if R 6 is hydrogen then R 7 may additionally be C 1 -C 4 alkyl; R 8 is group (A) or (B) X is O, O-CH 2 - or -O(CHR 14 )-; n is 0-10; provided that (i) if n is 0, and X is O, then R 8 is a group A; (ii) if n is other than 0, then X is O and R 8 is the group A; R 9 and R 10 independently of one another are hydrogen or C 1 -C 4 alkyl; R 11 and R 12 independently of one another are C 1 -C 4 alkyl or form together with the C atom to which they are attached a 5 to 7 membered saturated carbocyclic ring; R 13 is hydrogen, C 1 -C 4 alkyl, C 5 -C 7 cycloalkyl, 2-tetrahydropyranyl or Si(C 1 -C 4 alkyl) 3 ; R 14 is a group (A'); and R' 13 has one of the meanings as given for R 13 or is the group (C); are effective photoinitiator compounds.
摘要:
The present invention pertains to a novel process for the preparation of Fluoroalkylpyrazole- or Bisperfluoroalkypyrazole carboxylates (I) comprising a cyclization of PerfluoroalkyI ketoesters (II) with hydrazines (lll).
摘要:
The present invention is related to a new process for the preparation of 4-methyloxazole-5-carboxylic ester, which is a valuable intermediate in the synthesis of pyridoxine (vitamin B 6 ). The present invention is also related to a new intermediate for the preparation of 4-methyloxazole-5-carboxylic ester and processes for the preparation thereof.