| http://www.w3.org/ns/prov#value | - (a) the reaction of a 4-R1 -5-R2 -6-R3 -7-R4 -indan-2-one with a compound of formula (3-R5 -4-R6 -5-R7 -phenyl)YZm, wherein R1, R2, R3, R4, R5, R6 and R7 have the above defined meaning, Y is a metal is selected from alkaline and earth-alkaline metals, Z is an halogen atom, m is 0 when Y is an alkaline metal and is 1 when Y is an earth-alkaline metal;
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