Chemical Abstracts Volume 8

Chemical Abstracts Volume 8

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...acid, obtained in 6-7 g. yield by heating 55 g. anhydrous (CH;CO, Na); with 40 g. piperonal and 54 g. AccentsO 10 hrs. at 115, distilling with steam, filtering the residue hot, adding excess of fuming HC1 to the cold filtrate and crystg. from AcMe, tablets, sinters 114, m. 117-8, distils without decompn. in vacuo but decomps. completely under atm. pressure; 1 g., however, yielded so little distillate that the expected 6,7-methylenedioxy-1-naphthol could not be identified. Shaken in a. H atm. with 0.05 g. Pd colloid, 4.1 g. of the acid and 1.4 g. K;CO; in 200 cc. H20 gave quant. 'y-3,4-methylenedioxyphenylbutyric acid, prisms, m. 83; 4.2 g. of the satd. acid were warmed 2 hrs. at 5o--6o with 1.8 g. PCl, dild. with Et1O, poured from the I-LPO; and heated under 12-5 mm.; the product turned dark red and evolved HC1 and mcthylenediaxybenza-R-hexenone, b" 191, needles, m. 77-8, distilled over; semicarbazone, cryst. powder, m. 258 (decompn.). The evolution of HC1 on heating the crude product was so faint, however, that it was suspected that it was not wholly the chloride but already contained considerable ketone; that this suspicion was well founded was shown by satg. the product in dry Et;O with N H, gas; after freeing the product of the H10-sol. constituents, it was recrystd. from ligroin; this yielded only a very small amt. of a cryst. substance, m. about 145 (amide?) while the mother liquors yielded the above ketone (1 g. of semicarbazone). Crude piperonylpropionyl chloride, from the acid and PCl, behaved on distillation under 25 mm. exactly like the piperinyl chloride, yielding 4,5-1nethylenedioxy-a-hydrindone, m. 161. That the crude product before distillation did not contain the ketone was shown by the fact (1) that it dissolved ishow more

Product details

  • Paperback | 958 pages
  • 189 x 246 x 48mm | 1,674g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236940490
  • 9781236940490