摘要:
The invention relates to a new and improved process for the preparation of 6-demethyl-6-deoxy-6-methylene-5-oxytetracycline and the 11a-chloro derivative thereof by dehydrating 11a-chloro-5-oxytetracycline-6,12-hemiketal, which comprises treating 11a-chloro-5-oxytetracycline-6,12-hemiketal or an acid salt thereof with a dehydrating mixture formed by the reaction of chloro sulfonic acid and formic acid and isolating the 11a-chloro-6-demethyl-6-deoxy-6-methylene-5-oxytetracycline and salt thus obtained and optionally dehalogenating the same by reaction with a reducing agent.The advantage of the process of the present invention is that it is simple, economical and suitable for industrial scale manufacture and provides a pure product of high quality by excellent yields.
摘要:
A new process is disclosed for preparing a compound of the formula (I) ##STR1## wherein R is C.sub.1 to C.sub.5 alkyl; which comprises reducing a compound of the formula (II) ##STR2## or salt thereof wherein A is --SO.sub.2 X, --SOH, --SOA.sup.1, or --SA.sup.1 group,X is chlorine or hydrogen; andA.sup.1 is a group of the Formula ##STR3## with the aid of aluminum activated with a catalytic amount of a metal and/or metal salt in a mixture of water, a mineral acid, and an aliphatic carboxylic acid having 1 to 3 carbon atoms at a temperature of 0.degree. to 100.degree. C., thereafter, optionally, the product is recovered from an acid medium at a pH range of 2 to 3 in crystalline form.
摘要:
Compounds of the formula, ##SPC1##WhereinR.sup.1 and R.sup.2 each stand for hydrogen or a group of the generalformula --(CH.sub.2).sub.n --SO.sub.3 H,n is an integer between 1 and 5, andR.sup.3 stands for an alkyl group,As well as the salts and quaternary salts thereof have been prepared by various methods. The new compounds according to the invention possess valuable fungicidal and/or ovicidal properties, and can be used as active ingredients of plantbiological compositions, cosmetics and pharmaceuticals, respectively.
摘要:
The invention concerns a new process for the preparation of biologically active 2-[(alkoxycarbonyl)amino]-5-(alkylthio)-1H-benzimidazoles of the general formula (V) ##STR1## wherein R and R.sup.1 independently stand for alkyl having 1 to 3 carbon atoms.
摘要:
The invention relates to a method of combatting phytopathogenic fungi, primarily powdery mildew. The method involves administering compositions according to the invention which contain as active principle at least one compound of the formula (I), ##STR1## wherein R.sup.1 is a C.sub.1-12 alkyl or a chloroethyl group,R.sup.2 is hydrogen, halogen, a C.sub.1-4 alkyl, a C.sub.1-4 alkoxy or nitro group,R.sup.3 is hydrogen, halogen, a C.sub.1-4 alkyl or nitro group, andR.sup.4 is hydrogen, halogen, a C.sub.1-4 alkyl or nitro group, or an acid addition salt thereof.
摘要翻译:本发明涉及一种防治植物病原真菌,主要是白粉病的方法。 该方法包括施用本发明的组合物,其含有至少一种式(I)的化合物,其中R1是C1-12烷基或氯乙基,R2是氢,卤素, C 1-4烷基,C 1-4烷氧基或硝基,R 3是氢,卤素,C 1-4烷基或硝基,R 4是氢,卤素,C 1-4烷基或硝基,或酸加成 的盐。