Contributions to the history of the phosphorus-bases / by Augustus William Hofmann.
- August Wilhelm von Hofmann
- Date:
- 1861
Licence: Public Domain Mark
Credit: Contributions to the history of the phosphorus-bases / by Augustus William Hofmann. Source: Wellcome Collection.
Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.
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![These numbers lead to the formula C,3 H22 P Pt Cl:t = [(C2 H5)3 (C, H7) P] Cl, Pt Cl2, which represents the platinum-salt of a phosphonium in which the fourth equivalent of hydrogen is replaced by the molecule C7H7 (probably benzyl, the radical of benzyl-alcohol). Theory. Experiment, w. ( r I. II. m. IY. ■» V. ^13 156 37-66 37-25 37-46 37-41 h22 22 5-31 5-32 5-36 5-34 p 31 7-49 Pt 98-7 23-83 23-87 23-83 Cl3 106-5 25-71 25-65 414-2 100-00 The transformation of triethylphosphine under the influence of dichloride of ben- zylene, evidently takes place according to the following equation: 3[(C2 H5)3 P] + c7 h6 ci2 + h2 O = [(C2 H5)3 H P] Cl + [(C2 H5)3 (C7 H-) P] Cl + (C2 H5)3 p o. It may be that the formation of the triethyl-benzylphosphonium-compound is preceded by the production of an ephemeral diatomic base containing the radical C7 Hc, (C2H5)3 2[(C2H3)3P] + C7H6C12 = pi (c'H6)(cIh5);pJ^ which is subsequently decomposed under the joint influence of water and an excess of triethylphosphine. I have not, however, been able, experimentally, to trace this base. Moreover, a difference in the deportment of triethylphosphine with the com- pounds of ethylene and benzylene is readily intelligible, if we recollect that they are far from being analogous, bichloride of benzylene representing in the benzyl- group the diatomic derivatives which have been obtained from ethylic aldehyde. The analysis of the benzyl-triethylphosphonium-platinum-salt concludes the experi- mental part of this section of my researches. The following Table gives at a glance the several groups of bodies examined in Parts II. and III. of this inquiry. MONATOMIC COMPOUNDS. PHOSPHORUS-GROUP. Monophosphonium-salts. Ethyl-series. Salt of Tetrethylphosphonium [(C2 H5)4 P] Br. Salt of Bromethyl-triethylphosphonium [(C2 H4 Br) (C2 H5)3 P] Br. Salt of Chlorethyl-triethylphosphonium [(C2 H4 Cl) (C2 H5)3 P] Br. Salt of Oxethyl-triethylphosphonium [(C2 H4 HO) (C2 H5)3 P] Br. Salt of Vinyl-triethylphosphonium [(C2 H3) (C2 H5)3 P] Br.](https://iiif.wellcomecollection.org/image/b21309024_0128.jp2/full/800%2C/0/default.jpg)
