The invention relates to an improved process for the preparation of fungicidally active compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 individually are lower alkyl of from 1 to 4 carbons or halo-(lower alkyl) of from 1 to 4 carbons or R.sub.1 and R.sub.2 together with the carbon to which they are attached form a 3 to 7 membered cycloalkyl ring or lower alkyl-substituted cycloalkyl of from 4 to 9 carbons, R.sub.3, R.sub.4 and R.sub.5 individually are hydrogen or lower alkyl of from 1 to 4 carbons and X is methylene or oxygen, and salts of those compounds which are basic. The improved process comprises the reaction of a compound of the formula, ##STR2## wherein R.sub.3, R.sub.4, R.sub.5 and X have the significance given hereinabove, with a compound which forms a carbonium ion of the formula ##STR3## wherein R.sub.1 and R.sub.2 have the significance as given hereinabove.
该发明涉及一种改进的制备具有杀真菌活性的化合物的过程,其
化学式为##
STR1##其中R.sub.1和R.sub.2分别为1至4
碳原子的低
碳烷基或1至4
碳原子的卤代-(低
碳烷基),或R.sub.1和R.sub.2与它们连接的
碳形成3至7成员的
环烷基环或4至9
碳原子的低
碳烷基取代的
环烷基,R.sub.3、R.sub.4和R.sub.5分别为
氢或1至4
碳原子的低
碳烷基,X为亚
甲基或
氧,并且这些化合物的盐是碱性的。该改进的过程包括化合物的反应的反应,其
化学式为##
STR2##其中R.sub.3、R.sub.4、R.sub.5和X具有上述给定的含义,与形成
碳离子的化合物的反应,其
化学式为##
STR3##其中R.sub.1和R.sub.2具有如上所述的含义。