Kantilal C Pandya
Articles written in Proceedings – Section A
Volume 4 Issue 4 October 1936 pp 452-458
Volume 7 Issue 6 June 1938 pp 369-375
Malonanilic acid has been condensed with several aromatic aldehydes and a comparative study is made of the yields obtained by (
The yields obtained by applying method (
Incidentally, therefore, the utility of method (
Volume 7 Issue 6 June 1938 pp 376-380
Cinnamaldehyde has been condensed with four amides, in the presence of a trace of pyridine as well as in the absence of any reagent. The yields are on the whole good. The presence of the base does not very much affect the yield.
The product in all cases is the cinnamylidenebisamide.
Similarly hydrocinnamaldehyde is also condensed with benzamide and gives a fair yield of the bisamide.
Volume 7 Issue 6 June 1938 pp 381-383
2: 4 Resorcylaldehyde undergoes condensation with malonic acid giving umbelliferon or umbellic acid according to the conditions. The yield is as expected lower than the lowest obtained with mono-hydroxybenzaldehydes.
A trace of pyridine gives better yield than any method, except that the yield is slightly higher when glacial acetic acid is used in place of a base.
Volume 9 Issue 6 June 1939 pp 508-510
The condensation of
Volume 9 Issue 6 June 1939 pp 511-517
Condensations of protocatechuicaldehyde, vanillin and veratraldehyde with malonic acid in the presence of various proportions of bases, and in the absence of any base, show that the hydroxy-group generally diminishes the yield, which rises when the group is methylated. Influences of different proportions of the base, and of different temperatures and periods of time at which the reactions are allowed to proceed are recorded. The trace of the base is generally as efficient as ever. The nitro-group on the other hand, when present on the nucleus, is not found to exert any restraining influence on the yields obtained, and allows very high yields of the nitro-cinnamic acids.
Volume 10 Issue 4 October 1939 pp 279-281
Volume 10 Issue 4 October 1939 pp 282-284
Volume 10 Issue 4 October 1939 pp 285-288
Condensations of the three
Volume 13 Issue 2 February 1941 pp 119-121
The condensations of
Volume 13 Issue 2 February 1941 pp 122-125
Condensations of the three nitrobenzaldehydes with malonanilic acid have been studied in the absence of any catalyst or condensing agent. The benzylidenemalonanilic acids are thus obtained. The
Volume 13 Issue 5 May 1941 pp 461-466
Volume 14 Issue 1 July 1941 pp 18-24
Piperonal condenses best when heated without any other condensing reagent, with seven of the common amides, giving characteristic piperonyl-
Volume 14 Issue 1 July 1941 pp 25-28
The condensations of 6-nitropiperonal with amides have been studied. The products are in their properties in a line with the products obtained from piperonal itself. In the case of acetamide and cinnamamide the yields were distinctly higher than they were with piperonal: in other cases the reaction was distinctly slower and gave lesser yields.
Volume 14 Issue 2 August 1941 pp 112-122
The condensation of aldehydes with malonic acid - Part XIII. The condensation of
Benzaldehyde and four haloid-benzaldehydes have been condensed with malonic acid, in the presence of a trace of pyridine as well as in the entire absence of any condensing agent.
The yields in all cases have been excellent, in some cases almost quantitative.
Chlorine and bromine have undoubtedly accelerated the condensation and increased the yields.
Compared to the yields obtained by Perkin’s method, these yields are very superior, the condensations quicker and the products cleaner.
Volume 15 Issue 1 January 1942 pp 6-10
Volume 15 Issue 4 April 1942 pp 258-263
Volume 17 Issue 1 January 1943 pp 1-6
Volume 18 Issue 3 September 1943 pp 164-170
5-Bromosalicylaldehyde and 3:5-dibromosalicylaldehyde have both been condensed with malonic acid in the presence of pyridine as well as in its entire absence, and the yields are on the whole greater than were obtained from the condensation of salicylaldehyde with malonic acid in the presence of pyridine, the highest being 92·5%. Perkin's reaction gave different products altogether and in much smaller yields.
Volume 20 Issue 4 October 1944 pp 169-174
Malonanilic acid have been condensed under different conditions, with 6-nitro-piperonal, 6-bromopiperonal, 5-bormovanillin and 5-bromoveratraldehyde. The reactions with the first two give yields that may be more or less expected. The last two give some unexpected features, particularly 5-bromoveratraldehyde from which the expected cinnamanilide has not yet been isolated or obtained. All the products described in the paper are new.
Volume 22 Issue 6 December 1945 pp 400-404
The condensation of
Volume 23 Issue 1 January 1946 pp 1- Erratum
Volume 27 Issue 3 March 1948 pp 196-201
Volume 27 Issue 3 March 1948 pp 240-243
6-Bromo-piperonal has been condensed with malonic acid and gives two different products; 6-bromo-piperonyl-acrylic acid (the highest yield being quantitative) and 6-bromo-piperonyl-malonic acid (the highest yield being 72%). The presence of pyridine gives the first, that of glacial acetic acid gives the second.
Volume 29 Issue 1 January 1949 pp 56-63
5-Chloro- and 3 ∶ 5-dichlorosalicylaldehydes have been condensed with different amides under different conditions. In contrast with the_-
Volume 29 Issue 5 May 1949 pp 364-366
Salicylaldehyde-amide condensations always produced the salicylidene-