What have you smoked? You asked that last week in Post 475089 (https://www.thevespiary.org/talk/index.php?topic=9722.msg47508900#msg47508900)
(ADDkid: "Benzyl cyanide Propose Mech", Methods Discourse)
Edit: Ok, editing your post huh... In what unit do you want the difficulty expressed? Please specify your question some more...
Another method of drying ethyl ether is in Post 247216 (https://www.thevespiary.org/talk/index.php?topic=6331.msg24721600#msg24721600)
(lugh: "Re: Drying Ether With NaOH", Chemistry Discourse); for preparing ether, the catalytic method of Senderens is rather facile:
Catalytic dehydration of aliphatic alcohols, in the vapor phase, in the presence af pumice soaked with sulfuric and phosphoric acids. JEAN-BAPTISTE SENDERENS. Compt. rend. 192, 1335-7(1931); cf. C. A. 24, 4256.-The vapors of MeOH, EtOH, PrOH, iso-PrOH and iso-BuOH were passed through an electrically heated tube contg. a porcelain boat with pumice soaked with 50-2° Be. H2SO4. The last 3 alcohols. gave results similar to those obtained with NaHSO4. EtOH and MeOH were dehydrated, yielding Et20 and Me20, resp., the former at 135° in theoretical yield and the latter in greater quantity than that produced with Al2O2 at 300°. S. considers this method preferable to that generally used for the synthesis of Et2O. At 140° some C2H4 was also produced. After 8 days of operation at 8 hrs. per day, the contents of the boat appeared to be unaltered and the tube was dry. The pumice has an influence on the course of the reaction, for without it a black liquid was formed. Substitution of H2P04 for H2SO4 gave C2H4 at 180-5°, but the activity is very much less than that of H2SO4 and less than that of H2PO4 in Iiquid-phase operations.
(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_imgs/djvu.gif)
Comptes Rendus 192(22), 93-95 (1931)
50 to 52° Baume is equal to 63-65% H2SO4.
A high yield Grignard carboxylation was published by Ivanoff:
(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_imgs/djvu.gif)
Bull. Soc. Chim. France 287-296 (1925)
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