2-Hydrazino-3-phenyl-4(3H)-quinazolinone (1) underwent ring closure with aliphatic acid, aldehydes, and carbon disulfide to 1-alkyl-, 1-aryl-, and 1-mercapto-4-phenyl-1,2,4-triazolo[4,3-a]quinazolin-5(4H)-ones (7) for instance. The 1-alkylthio-3-phenyl-1,2,4-triazolo[4,3-a]quinazolin-5(4H)-ones were readily obtained from 7 and alkyl halides. Reaction of 1 with ethyl acetoacetate gave the corresponding hydrazone which was readily converted into 2-(3-methyl-5-oxo-2-pyrazolin-1-yl)-3-phenyl-4(3H)-quinazolinone

Ferrocenyl pyrazolines have been prepared by the reaction of ferrocenyl chalcones with diazomethane and/or substituted benzenesulphonyl hydrazides. A Michael reaction on ferrocenyl chalcones using phenyl benzyl ketone and/or thiophenol yielded the corresponding ferrocenyl pentan-1,5-diones and ferrocenyl--ketosulphides, respectively

Ferrocenyl pyrazolines have been prepared by the reaction of ferrocenyl chalcones with diazomethane and/or substituted benzenesulphonyl hydrazides. A Michael reaction on ferrocenyl chalcones using phenyl benzyl ketone and/or thiophenol yielded the corresponding ferrocenyl pentan-1,5-diones and ferrocenyl--ketosulphides, respectively

Ferrocenyl pyrazolines have been prepared by the reaction of ferrocenyl chalcones with diazomethane and/or substituted benzenesulphonyl hydrazides. A Michael reaction on ferrocenyl chalcones using phenyl benzyl ketone and/or thiophenol yielded the corresponding ferrocenyl pentan-1,5-diones and ferrocenyl--ketosulphides, respectively

2-Chloro-3-methylquinoxaline reacts with aromatic amines in basic medium forming 2-arylamino-3-methylquinoxalines, also it reacts with mercaptoacetic acid. The 3-methyl-2(1H)-quinoxalinone condenses with aromatic aldehydes forming the corresponding 3-(substituted styryl)-2(1H)-quinoxalinones which add bromine in acetic acid to yield the corresponding dibromo derivatives which react with morpholine, sodium methoxide, and piperidine to give the corresponding compounds. 3-Methyl-2(1H)-quinoxalinone undergoes side-chain bromination to yield 3-bromomethyl-2(1H)-quinoxalinone, which reacts with aromatic amines, sodium salt of saccharine, potassium phthalimide··· 3-Methyl-2(1H)-quinoxalinone with P2S5 gave 3-methyl-2(1H)-quinoxalinethione which reacts with 2-aminoethanol, dimethyl sulfate, and halo acids

2-Chloro-3-methylquinoxaline reacts with aromatic amines in basic medium forming 2-arylamino-3-methylquinoxalines, also it reacts with mercaptoacetic acid. The 3-methyl-2(1H)-quinoxalinone condenses with aromatic aldehydes forming the corresponding 3-(substituted styryl)-2(1H)-quinoxalinones which add bromine in acetic acid to yield the corresponding dibromo derivatives which react with morpholine, sodium methoxide, and piperidine to give the corresponding compounds. 3-Methyl-2(1H)-quinoxalinone undergoes side-chain bromination to yield 3-bromomethyl-2(1H)-quinoxalinone, which reacts with aromatic amines, sodium salt of saccharine, potassium phthalimide··· 3-Methyl-2(1H)-quinoxalinone with P2S5 gave 3-methyl-2(1H)-quinoxalinethione which reacts with 2-aminoethanol, dimethyl sulfate, and halo acids

2-Chloro-3-methylquinoxaline reacts with aromatic amines in basic medium forming 2-arylamino-3-methylquinoxalines, also it reacts with mercaptoacetic acid. The 3-methyl-2(1H)-quinoxalinone condenses with aromatic aldehydes forming the corresponding 3-(substituted styryl)-2(1H)-quinoxalinones which add bromine in acetic acid to yield the corresponding dibromo derivatives which react with morpholine, sodium methoxide, and piperidine to give the corresponding compounds. 3-Methyl-2(1H)-quinoxalinone undergoes side-chain bromination to yield 3-bromomethyl-2(1H)-quinoxalinone, which reacts with aromatic amines, sodium salt of saccharine, potassium phthalimide··· 3-Methyl-2(1H)-quinoxalinone with P2S5 gave 3-methyl-2(1H)-quinoxalinethione which reacts with 2-aminoethanol, dimethyl sulfate, and halo acids