A process comprising reacting a 2-methyloxazoline of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently is hydrogen, alkyl, aralkyl, optionally substituted aryl or two of them together form a ring, with a 3-methyl-2-buten-1-yl derivative of the formula ##STR2## in which X is halide, sulphonate or phosphate, thereby to produce a 2-methyl-3-(3-methyl-2-butenyl)-2-oxazolinium salt of the formula ##STR3## reacting the oxazolinium salt with an alcoholate of the formula R.sup.5 --O--M (V) in which M is one equivalent of an alkali metal or alkaline earth metal cation, to produce an oxazolidine of the formula ##STR4## pyrolyzing the oxazolidine to produce a 2-methylene-3-(3-methyl-2-butenyl)-oxazolidine of the formula ##STR5## and heating the 2-methylene-3-(3-methyl-2-butenyl)-oxazolidine to produce a 2-(2,2-dimethyl-3-buten-1-yl)-2-oxazoline of the formula ##STR6## The compounds (II), (III) and (IV) are new.
一种反应过程,包括将式子##STR1##中R.sup.1,R.sup.2,R.sup.3和R.sup.4各自独立地为氢、烷基、芳基烷基、可选取代芳基或其中两个结合形成环的2-甲氧基
噁唑啉与式子##STR2##中X为卤素、
磺酸盐或
磷酸盐的3-甲基-
2-丁烯-1-基衍
生物反应,从而产生式子##STR3##中的2-甲基-3-(3-甲基-
2-丁烯基)-2-
噁唑啉盐,将
噁唑啉盐与式子R.sup.5--O--M(V)中的醇酸盐反应,其中M是一当量的碱
金属或碱土
金属阳离子,从而产生式子##STR4##的
噁唑烷,将
噁唑烷热解产生式子##STR5##的2-亚甲基-3-(3-甲基-
2-丁烯基)-
噁唑烷,然后将2-亚甲基-3-(3-甲基-
2-丁烯基)-
噁唑烷加热产生式子##STR6##的2-(2,2-二甲基-3-
丁烯-1-基)-2-
噁唑啉。化合物(II),(III)和(IV)是新的。