2,5-Dimethyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline and 2-tert-butyl-5-methyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline
摘要:
In both 2,5- dimethyl- 6,7- dihydrobenzo[ h] pyrazolo[ 1,5- a]quinazoline, C16H15N3, ( I), and 2- tert- butyl- 5- methyl- 6,7dihydrobenzo[ h] pyrazolo[ 1,5- a] quinazoline, C19H21N3, ( II), which crystallizes with Z' = 2 in the space group P1, the nonaromatic carbocyclic rings adopt screw- boat conformations. The molecules of ( I) are linked into chains of rings by a combination of C - H center dot center dot center dot N and C - H center dot center dot center dot pi( arene) hydrogen bonds, while in ( II) there are no hydrogen bonds of any kind.