Nonacyclic Ladder Silsesquioxanes and Spectral Features of Ladder Polysilsesquioxanes

Table 1

²⁹Si NMR chemical shift of laddersiloxanes.

Compounds	^29Si NMR chemical shift/ppm
syn-Tricyclic laddersiloxane [4, 5]	−67.2
anti-Tricyclic laddersiloxane [4, 5]	−66.8
All anti-Pentacyclic laddersiloxane [7]	−65.8, −65.2
anti-syn-syn-Pentacyclic laddersiloxane [6]	−66.5, −65.9
Heptacyclic laddersiloxane (isomeric mixture) 3 [8]	−66.2 to −64.9
Nonacyclic ladder silsesquioxanes (isomeric mixture) 6	−66.5 to −65.5
Methyl ladder polysilsesquioxane (solid state) [9]	−64.5