exxxii Proceedings of the Asiatic Society of Bengal. [(N.S., XV, 
jaa NH. CH .(CgH;).CO. os | 
ba, 
attempt was made to close the ring by boiling with acetic anhy- 
aride but this only resulted in the formation of a diacetyl derivative. 
Synthesis ~ ipytenal derivatives——By A. K. Das and 
B. N. Guo 
osh and his collaborators have shown (T. 1915, 107, re TIS, 
113, err that aromatic ohydroxybenzaldehyde conden with sub- 
stances containing the group ‘CO-CH - CO- to form Py wicks derivatives. 
With alkali 
a. 
pound is first obtained and this or the obtoheas substances in al- 
coholie ree with dry hydrogen chloride gave the desired pyranol 
eri 
he present investigation a substance of similar type such a 
dosoxy-benzoin Sank wekaue was taken. Here the methylene group 
is situat 1 and a phenyl group instead o 
yranol derivative was isolated by treatment with dry 
hydrogen chloride but the intermediate ‘salicylidene’ compound could 
obtained wi ka ide 
stituted for t ound. But ing separat- 
with alka an hydroxide eS with | yore ede a substance 
was obt a which could not be crystallized. 
med pe ati ar and — efore bone investigation was further 
to “to other. aldehydes such as anisaldehyde, png and p- 
CH,00,H,CH= i 
bo. Ph 
th dry hydrogen chloride under different experimental conditions 
a Peleg ads desoxybenzoin 
h 
nk 
CH;0. CsH,CH = “- 
Ph 
and (3) Bags Pacino desoxy benzo: 
= canta = soxybenzoin two subst benoos were isolated, 
na lp rd ye d (2) chloropiperony] desoxybenzoin, and 
Re ptoluy! aahyde “) peeled amaron and (2) qnaerocehay] desoxy- 
Tt i is ae es when the hydroxy tp remains free t action 
is retarded but if this is methylated as in anisaldehyde or 0 position 
taken up by a a methyl group as in prtaltiys eebede the reaction goes on 
in the usu 
Condensation a 1-phenyl-3-methy1-5- — with 
al co er etones.—By S. C. CHATTERJEE @ 
B. N. Guo 
Sis, tpg ectetprmacice is heated with aldehydes 
in molec fare ons, condensa ually takes place with the 
oe of water. The compounds thus obtained have the general 
orm 
