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XX. The Bakekian Lecture. — Researches on Organo-metallic Bodies.— FowciYi Memoir. 
By E. Franeland, Ph.B . , F.R.S . , Lecturer on Chemistry at St. Bartholomew s Hospital. 
Eeceived February 17, — Bead March 3, 1859. 
Ih a former memoir I described the production of a series of organic compounds 
containing the metal tin in combination with the radicals methyl, ethyl, and amyl. 
These bodies were formed by the action of light or heat upon the iodides of methyl, 
etliyl, and amyl, respectively placed in contact with strips of tinfoil. My attention was 
at that time especially directed to the compound formed by the union of tin with ethyl, 
and to which the name of stanethyl was given. The iodide of stanethyl (Sn C4H5I) was 
prepared by exposing iodide of ethyl to light or heat in the presence of tinfoil ; and by 
acting with zinc upon an aqueous solution of this iodide of stanethyl or of the chloride 
of the same body, stanethyl itself (C4H5Sn) was obtained. 
In accordance with a theory of the constitution of all organo-metallic bodies which I 
then proposed, the above tin compounds were respectively represented as the analogues 
of the protiodide and biniodide of tin ; thus — 
^Snl Sn(C4H,) 
Stannous iodide. Stannous ethide. 
s„{(aH,) 
V. J 
V ; 
Stannic ethiodide. 
to the above bodies would receive 
additional support if the second equivalent of iodine in the stannic iodide could be 
replaced by ethyl, or some other analogous organic group. In the memoir already 
alluded to, I mentioned that in studying the behaviour of stanethyl under the influence 
of heat, evidence was obtained of the existence of this very compound — stannic ethide, 
or hinethide of tin, as I then named it. This body obviously bears the same relation to 
stannic iodide, as stanethyl bears to stannous iodide. 
Sn 
I 
I 
Stannic iodide. 
It is evident that the application of this view 
Sn 
I 
I 
Stannic iodide. 
[C 4 H, 
1C4H, 
Tv 'f 
Stannic ethide. 
Although there could be little doubt of the formation of stannic ethide by heating 
stanethyl to 150 C., yet I could not succeed in obtaining the former body in a state of 
puiity from this source. It occurred to me, however, that stannic ethiodide would 
