ALKALI METAL DERIVATIVES OF GROUP IV ORGANOMETALLICS: MECHANISTIC ASPECTS OF REACTIONS WITH HALIDES
Organometallic derivatives of the Group IV elements have been known and used as synthetic intermediates for a half century, but little has been done by way of systematic investigation of the scope, and limitations of their reactions. And only recently have investigators turned their attentions to the study of mechanistic aspects of these reactions. An overview of the field reveals many highly useful facts, but it is also strewn with some contradictory observations, along with many others that are difficult to fit into a coherent overall conceptual scheme. This scheme lies beyond the present horizon and will be revealed only after completion of systematic studies on the various parameters affecting the scope, limitations, and mechanisms of these reactions. Delineation of these, in turn, will provide reliable guides to their synthetic utility. This report deals with our present understanding of the mechanisms of Group IV organometalalkalis with organic halides, with reference to other reactions as appropriate, and with some of the questions concerning these reactions, whose answers lie beyond the horizon. Experimental observations which are relevant for understanding of mechanisms will be first summarized; mechanisms consistent with these will be reviewed; and questions remaining to be answered will be raised. Because of the nature of the presently known facts, those concerning silicon, germanium, tin, and lead alkalis will be intermingled, and valid trends within the series will be indicated.
Investigations on organolead compounds VI. Triphenylplumbylsodium and triphenylplumbylmagnesium halide
Triphenylplumbylsodium can be prepared from hexaphenyldilead and finely divided sodium in tetrahydrofuran at room temperature while triphenylplumbylmagnesium halide can be conveniently prepared from lead dichloride and phenylmagnesium chloride or bromide in tetrahydrofuran. 
 
These reagents resemble the previously investigated compound triphenylplumbyllithium in many respects. They usually couple readily with reactive halides, but sometimes an exchange reaction is observed. The tendency to exchange increases in the order: Ph3PbNa< Ph3PbLi< Ph3PbMgX.
Religion and school
The report presents and argues in favor of the thesis that the secular school offers no alternative in modern society. Simultaneously, the author displays the basic contours of spiritual physiognomy of such a modern school which in many ways differs from the, school we know in this country. The school the author pleads for does not decide among various contents that influence forming of the young, within which the line is established between theism - atheism, but, on the contrary, pleads for the principle of humanistic education. The predominant here is the notion of methodological skepticism which marks the principle by which the process of education should be realized as though there were no God, or - which is on the same level - as though there were God. Out of this basic principle any others upon which the concept of modern secular school the author pleads for is established can be drawn. It ought not to neglect the rich, scientifically confirmed knowledge on the phenomenon of religion and atheism, which should be, presented in all school subjects where the contents allow for it as well as the Religious Culture should be introduced as a compulsory subject. By introducing this subject as a collection of knowledge on the phenomenon of the, religious, we would avoid imposing a particular religious culture as an attitude, behavior, belief and evaluation.