Syntheses Classified by Number of Ring Atoms in Each Compound

9 Syntheses Classified by Number of Ring Atoms in Each Compound 

10 SYNTHESES CLASSIFIED BY NUMBER OF RING ATOMS IN EACH COMPOUND 

The same classification as in CHEC-I 84CHEC-I(5)167 is be followed. It is clear that two methods of preparing pyrazoles and their derivatives continue to dominate all other methods, in both the two nitrogen atoms come from one of the reagents, either hydrazine (see Section 3.01.10.1.2(ii) (CCC -f NN)) or a 1,3-dipole, diazoalkane, nitrilimine, etc. (see Section 3.01.10.1.2(h) CNN CC)).. The other methods are curiosities mostly discovered by hazard or variations of these two great principles. 

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