By Robert H. De Wolfe
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Of their contribution to the 1st variation of this guide, entitled "The Teeth," LEHNER and PLENK (1936) mentioned the tissues constituting the "perio dontium" really in short. unlike the special paragraphs facing, for instance, the teeth and dentine, the part (about forty pages and 20 illustra tions, generally drawings) dedicated to periodontal tissues didn't offer a real evaluate and precis of the modern wisdom and most recent advancements in learn at the quite a few parts of the periodontium.
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Additional resources for Carboxylic Ortho Acid Derivatives: Preparation and Synthetic Applications
In spite of these limitations a number of ortho esters have been synthesized from ketene acetals, and several of them have been prepared in no other way. These include trimethyl orthodiphenylacetate (218), divinylethyl orthoacetate (205), divinyl-2-chloroethyl orthoacetate (205), three divinyl-2-nitroalkyl orthoacetates (100), trimethyl dimethoxyorthoacetate (143), triethyl 3,3-diethoxyorthopropionate (219), triethyl ortho-3-methyl3-butenoate (220), 2-methoxy- and 2-ethoxy-2-chloromethyl-l,3-dioxolanes (98, 209), 2-methoxy- and 2-ethoxy-2-dichloromethyl-l,3-dioxolanes (209, 308), and 2-methoxy-2-benzyl-l,3-dioxolane (209).
Similar 1,1-diacyloxy-1-alkoxyethanes are transient intermediates in the 53 SYNTHESIS OF ACYLOXY ORTHO ESTERS conversion of carboxylic acids to anhydrides by reaction with alkoxyacetylenes (90, 263, 356). CH (C0 H) + HC=COCH 2 2 2 3 • < X ( 3) 9 Lead tetraacetate oxidation of dibutyl ether gave a mixture of products containing 1 -butoxy-1,1 -diacetoxybutane and 1 -(1 -acetoxybutoxy)-1,1 -diacetoxybutane (158). Three methods of preparing acyloxy ortho esters in which the acyloxy group is incorporated into a lactone ring have been reported.
4250 (20°) 3 93a Η OCH IW X 3 CH, /—Ο OCH 3 V _ o / X H — 1 . 0010 1 1 2,5 275 309, 351 6a, 8a, 42, 232a, 233, 283. 344. 4425 — 11 153a 3 x 1. 5°-44710 ^-O Density d 6 C H s oc,H Refractive index /~°\/ 5 H K \ — ΟXOC H 2 6 1.
Carboxylic Ortho Acid Derivatives: Preparation and Synthetic Applications by Robert H. De Wolfe