The reaction of N(CH2CH2NHMe)3 with P(NMe2)3 or P(NMe2)2Cl yields the phosphatrane precursor N(CH2CH2NMe)2P,4. With oxydizing agents or electrophiles 4 is converted to the untransannulated four‐coordinated derivatives N(CH2CH2NMe)3PX, (X: O, S, Se, N3Ph, NPh, I CS2, 1/2 PtCl2). The structures of the compounds described are discussed by 1H, 13C, and 31P n.m.r. data.

The strong therapeutic potential of an organotin(IV) compound loaded in nanostructured silica (SBA-15pSn) is demonstrated: B16 melanoma tumor growth in syngeneic C57BL/6 mice is almost completely abolished. In contrast to apoptosis as the basic mechanism of the anticancer action of numerous chemotherapeutics, the important advantage of this SBA-15pSn mesoporous material is the induction of cell differentiation, an effect unknown for metal-based drugs and nanomaterials alone. This non-aggressive mode of drug action is highly efficient against cancer cells but is in the concentration range used nontoxic for normal tissue. JNK (Jun-amino-terminal kinase)-independent apoptosis accompanied by the development of the melanocyte-like nonproliferative phenotype of survived cells indicates the extraordinary potential of SBA-15pSn to suppress tumor growth without undesirable compensatory proliferation of malignant cells in response to neighboring cell death.

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