01904nas a2200181   4500008004100000022001400041245010800055210006900163260000800232300001600240490000700256520126000263100002001523700001901543700001901562700001901581856012201600       2021                        eng d  a1477-922600aPyridylpyrrolido ligand in Ge(II) and Sn(II) chemistry: synthesis, reactivity and catalytic application0 aPyridylpyrrolido ligand in GeII and SnII chemistry synthesis rea  cNOV  a16678-166840 v503 aIn our previous communication, we have reported the synthesis of a new chlorogermylene (B) featuring a pyridylpyrrolido ligand. This study details the preparation of a series of new germylenes and stannylenes starting from B. A transmetallation reaction between B and SnCl2 led to the analogous chlorostannylene (1) with the simultaneous elimination of GeCl2. This is a very unusual example of transmetallation between two elements of the same group. The preparation of 1via lithiation led to the formation of 2 as a side product, where the ortho C-H bond of the pyridine ring was activated and functionalized with a Bu-n moiety. Subsequently, B and 1 were used as precursors to generate germylene (4) and stannylene (5) featuring tris(trimethylsilyl)silyl (hypersilyl) moieties. We also prepared tetrafluoropyridyl germylene (6) by reacting 4 with C5F5N with the simultaneous elimination of (Me3Si)(3)SiF by utilizing the fluoride affinity of the silicon atom. As there is scarcity of Sn(II) compounds as single-site catalysts, we investigated 5 as a catalyst towards the hydroboration of aldehydes, ketones, alkenes and alkynes. All the compounds have been characterized by single-crystal X-ray diffraction and by state of the art spectroscopic studies.1 aPahar, Sanjukta1 aSharma, Vishal1 aTothadi, Srinu1 aSen, Sakya, S.  uhttps://library.ncl.res.in/content/pyridylpyrrolido-ligand-geii-and-snii-chemistry-synthesis-reactivity-and-catalytic