摘要:
4,6-Dichloropyrimidine is prepared by treating 4,6-dihydroxypyrimidine with a chlorinating agent of the formula R.sup.1 R.sup.2 R.sup.3 PCl.sub.2 wherein R.sup.1, R.sup.2 and R.sup.3 are independently alkyl or aryl, or one or more of the groups R.sup.1, R.sup.2 and R.sup.3 is linked to a polymer support. Conveniently, the chlorinating agent may be prepared in situ by reacting the corresponding phosphine oxide with phosgene. Thus, in a preferred process, 4,6-dichloropyrimidine is prepared by treating 4,6-dihydroxypyrimidine with phosgene in the presence of a phosphine oxide.
摘要翻译:通过用式R 1 R 2 R 3 PCl 2的氯化剂处理4,6-二羟基嘧啶来制备4,6-二氯嘧啶,其中R 1,R 2和R 3独立地是烷基或芳基,或者R 1,R 2和R 3中的一个或多个与 聚合物支持。 方便地,氯化剂可以通过使相应的氧化膦与光气反应而原位制备。 因此,在优选的方法中,通过在氧化膦存在下用光气处理4,6-二羟基嘧啶来制备4,6-二氯嘧啶。
摘要:
Methyl 2-(chloro- or bromomethyl)phenylacetate is prepared by treating 3-isochromanone with thionyl chloride or thionyl bromide in the presence of methanol.
摘要:
A process for preparing 2-(6-substituted pyrid-2-yloxymethyl)phenyacetates especially useful as intermediates for producing agricultural fungicides. The invention provides a compound having the formula (I): wherein A and D are independently selected from the group comprising halo, hydroxy, halo(C.sub.1-4)alkyl, C.sub.1-4 alkoxy, thio(C.sub.1-4)alkoxy, halo(C.sub.1-4)alkoxy, phenyl, phenoxy, nitro, amino, aclyamino, cyano, carboxy, C.sub.1-4 alkoxycarbonyl and C.sub.1-4 alkylcarbonyloxy, or D is C.sub.1-4 alkyl, and m is 0 or an integer of from 1 to 3. The process comprises treating a compound of formula (II): ##STR1## wherein A, D and m are defined as above and M is a metal atom, with a compound of formula (III): ##STR2## wherein L is a leaving group.
摘要:
3-Isochromanone is prepared by reacting o-tolyacetic acid with sulphuryl chloride in the presence of a free radical initiator, e.g. AIBN, followed by ring closure of the 2-chloromethylphenylacetic acid so formed with a base, e.g. potassium bicarbonate.
摘要:
A process comprising the reaction of an optionally substituted benzene with thiophosgene in the presence of a Friedel Crafts catalyst for the preparation of the equivalent optionally substituted benzophenthione. The benzophenthiones are converted into the equivalent benzophenone derivatives by hydrolysis.
摘要:
A chiral, organometallic compound which, at a molecular level, has no C2 symmetry and comprises a carbon to carbon bond joining a chiral carbon atom to a carbon atom of a cyclopentadiene ring that is non-symmetrically substituted. Examples of such compounds include compounds of formula (I): ##STR1## wherein X.sup.1 and X.sup.2 are, independently, groups which are removable during a chemical reaction; M is titanium, zirconium or hafnium; and R.sup.1-8,11 are as specified in the description.