Answers are grounded in this paper and cite their sources.
Only three of the four diethyl ether molecules are coordinated to the OH groups in the crystal structure of the aluminopolysiloxane 1. Compound 1 is obtained from tert-butoxyaluminum dihydride and diphenylsilanediol in Et2O. The fourth coordination site is sterically shielded by two oppositely placed OSi(Ph2)OSi(Ph2)O bridges. Replacement of Et2O with Et3N results in twofold deprotonation of the polycycle; now only two donor molecules can coordinate to the central eight-membered ring.
No takes yet. Share an insight, caveat, or question.
Veith et al. (1997) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: