Compound (R,R)-7

(11bR,11b'R)-4,4'-(Pentane-1,5-diylbis(methylazanediyl))bis(3,5-dimethyl-4,5-dihydro-3H-dinaphtho[2,1-d:1',2'-f][1,3,2]diazaphosphepine 4-oxide)

From: N-silyl oxyketene imines are underused yet highly versatile reagents for catalytic asymmetric synthesis