Ag ?HC 'OH ?H CO 2 H-f-H 2 N OH, and also on the production from sodium nitromethane and mercuric chloride, thus CH 2: NO Ohg - > H 2 O -I-C: NOhg (hg = 2 Hg).
Silberrad (Ber., to be a dihydro HC NH N --> 1V NH CH.
If the carbon atoms are connected by two valencies, we obtain a compound H2C:CH2, ethylene; if by three valencies, HC: CH, acetylene.
Thus ethane gives H3C CH2 CH3, propane; ethylene gives H 2 C:CH CH 3, propylene; and acetylene gives HC: C CH 3, allylene.
In comparison with the isomeric propylene, CH 3 HC:CH 2, it is remarkably inert, being only very slowly attacked by bromine, which readily combines with propylene.
The following diagrams illustrate these statements: - C ` H C OH HC /CH HC CH HC,/CH 'N/ HC CH CH CH From the benzene nucleus we can derive other aromatic nuclei, graphically represented by fusing two or more hexagons along common sides.
Berthelot first accomplished the synthesis of benzene in 1870 by leading acetylene, HC: CH, through tubes heated to dull redness; at higher temperatures the action becomes reversible, the benzene yielding diphenyl, diphenylbenzene, and acetylene.
Substituted acetylenes also exhibit this form of condensation; for instance, bromacetylene, BrC: CH, is readily converted into tribrombenzene, while propiolic acid, HC: C. COOH, under the influence of sunlight, gives benzene tricarboxylic acid.
'Cooh Ci, BrC CO CBr3+ H H2 HC ("CH, HC C /CH, H02C C02HCI CI (t) (2) C(3) (4) (5) The reduction of o-oxybenzoic acids by sodium in amyl alcohol solution has been studied by A.
CH CH HC, N CH HC CH HC HC HC Hcch Hc Ch Ch Kekule t i Dewar Ladenburg One of the earliest and strongest objections urged against Kekule's formula was that it demanded two isomeric ortho-di-substitution derivatives; for if we number the carbon atoms in cyclical order from i to 6, then the derivatives 1.2 and 1.6 should be different.'
From this he infers that cyanogen is C: N N :C and not N; C C; N, that hydrocyanic acid is HC N, and acetonitrile CH 3 C; N.
Bladin HC -N (Ber., 1892, 25, p. 183) by the action of acetic)NH anhydride on dicyanophenylhydrazine (formed N: CH from cyanogen and phenylhydrazine), the resulting acetyl derivative losing water and yielding phenylmethylcyanotriazole, which, on hydrolysis, gives the free acid.
HC:N ›NH N:CH ›NH HC:CH" Osotriazole (aa').
And III., pyrazine being I.: HC N CH HC NH CH HC N CH2 H2C NH CH2 HC N CH2 H2C NH H2 I (Pyrazine) II (1.4 dihydro) III (2.3 dihydro) IV (Piperazine).
ANTIPYRINE (phenyldimethyl pyrazolone) (C11H12N20), is prepared by the condensation of phenylhydrazine with acetoacetic ester, the resulting phenyl methyl pyrazolone being heated with methyl iodide and methyl alcohol to loo-110° C.: CH 0=N CH3 C-N CH3 >N C6H5 - II >N C6H6 CH 2 -CO HC-CO Phenyl methyl pyrazolone Antipyrine On the large scale phenylhydrazine is dissolved in dilute sulphuric acid, the solution warmed to about 40° C. and the aceto-acetic ester added.
Crotonic acid, isocrotonic acid and methacrylic acid; the constitutional formulae are HC CO 2 H HC C02H HC CH3 CH3 CH Crotonic Acid.
Pararosaniline was reduced to the corresponding leuco compound (paraleucaniline), from which by diazotization and boiling with alcohol, the parent hydrocarbon was obtained (H 2 N C 5 H 4) 2 C:C 6 H 4 :NH 2 Cl - HC(C6H4NH2 HCl)3 - >HC(C6H4N2C13) Pararosaniline hydrochloride.
-> HC(C6H5) 3.
CH(CH 3) CO 2 HC 2 H 5 CO CH 2 CH3; and by the action of zinc alkyls on acid chlorides (M.
Formamidine, HC: (NH)NH 2, is only known in the form of its salts, the hydrochloride being obtained by the action of ammonia on the hydrochloride of formimido-ethyl ether (A.