Novel .DELTA..sup.1-pyrrolines of the Formula (I) ##STR00001## in which R.sup.1, R.sup.2, R.sup.3 and Het have the meanings given in the description, a plurality of processes for preparing these compounds and their use for controlling pests, and also novel intermediates and processes for their preparation.

 
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> Methods for forming porous insulator structures on semiconductor devices

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