New and valuable pyrocatechol derivatives and a process for their preparation. The pyrocatechol derivatives have the formula ##STR1## wherein: R denotes alkyl of from 1 to 4 carbon atoms which may be substituted with halogen; alkenyl having up to 4 carbon atoms which may be substituted with halogen; alkynyl having up to 5 carbon atoms which may be substituted with halogen; or benzyl; R.sup.1 denotes hydrogen or alkyl of from 1 to 4 carbon atoms; R.sup.2 denotes benzyl or alkyl of from 1 to 3 carbon atoms which may be substituted with halogen, methoxy or ethoxy; R.sup.3 denotes alkyl of from 1 to 4 carbon atoms; cycloalkyl of from 3 to 7 carbon atoms; .beta.-chlorethyl; methoxyethyl; ethoxyethyl; alkenyl of from 2 to 4 carbon atoms; alkynyl of from 2 to 4 carbon atoms; acetyl; propionyl; R.sup.1 and R.sup.2 when taken together with the carbon atom to which they are attached form a cyclopentyl or cyclohexyl ring; and R.sup.1 and R.sup.3 when taken together with the carbon atom and oxygen atom to which they are attached form a tetrahydrofuranyl or tetrahydropyranyl ring. These compounds I are valuable starting materials for cleavage of the acetal structure to yield a pyrocatechol monoether of the formula ##STR2## in very high yields while retaining the R member, such monoethers preferably being reacted with methyl isocyanate to form N-methylcarbamates which have a pesticidal action.
新的有价值的
邻苯二酚衍
生物及其制备方法。该
邻苯二酚衍
生物的
化学式为##STR1##其中:R表示1至4个碳原子的烷基,可以用卤素取代;具有最多4个碳原子的烯基,可以用卤素取代;具有最多5个碳原子的炔基,可以用卤素取代;或苄基;R.sup.1表示氢或1至4个碳原子的烷基; R.sup.2表示苄基或1至3个碳原子的烷基,可以用卤素,甲氧基或乙氧基取代; R.sup.3表示1至4个碳原子的烷基;3至7个碳原子的环烷基;β-
氯乙基;甲氧基乙基;乙氧基乙基;具有2至4个碳原子的烯基;具有2至4个碳原子的炔基;乙酰基;丙酰基;当R.sup.1和R.sup.2与它们连接的碳原子一起形成
环戊烷或
环己烷环时;当R.sup.1和R.sup.3与它们连接的碳原子和氧原子一起形成
四氢呋喃基或
四氢吡喃基时。这些化合物I是有价值的起始材料,用于断裂
缩醛结构,以产生
化学式为##STR2##的
邻苯二酚单醚,收率非常高,同时保留R成员,这些单醚最好与
异氰酸甲酯反应,形成具有杀虫作用的N-
甲基氨基甲酸酯。