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Some nitriles reacted with camphene in the presence of heteropolyacids (H 3 PW 12 O 40 , H 4 SiW 12 O 40 , H 7 PMo 12 O 40 ) as catalyst to give N -(1,7,7-trimethylbicyclo[2.2.1]hept-2-yl)-substituted amides in fairly high yields.
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Kartashov et al. (2006) studied this question.
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