The way the three basic bricks of the B.A.S.I.C. (BINO−ANSA−SPIRO in cyclophosphazenes) game are built: a 121.5 MHz 31P NMR kinetic study

Abstract The 121.5 MHz 31 P NMR was used for elucidating kinetically the way the three basic bricks of the B.A.S.I.C. game are built. The formations of these three bricks obey second-order rate laws. The SPIRO loop is formed much faster than BINO bridge or ANSA arch. The 1,3-diaminopropane behaves as a genuine primary mono-amine. Kinetic data can be expressed in terms of very simple geometrical parameters such as ‘stability or not’ of the n -membered cyclic structures.