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Handbook of Functionalized Organometallics Applications in S

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466<br />

11 Polyfunctional Metal Carbenes for Organic Synthesis<br />

R L<br />

R S<br />

Me2N RL R S<br />

R 1<br />

68<br />

69<br />

O<br />

N<br />

O<br />

OH<br />

R<br />

Ph<br />

OH<br />

R L<br />

O<br />

(CO)5Cr<br />

R L<br />

R S<br />

R S<br />

R L=R S=Ph<br />

H<br />

67<br />

H<br />

R L<br />

RL<br />

R L<br />

O<br />

62<br />

+<br />

OR<br />

63<br />

2<br />

O<br />

64<br />

Ph<br />

OR 2<br />

R 1<br />

R 1<br />

R S<br />

NR 2<br />

NR2<br />

NR2<br />

R 1<br />

O<br />

RL<br />

O<br />

R S O<br />

65<br />

O<br />

66<br />

Scheme 11.21 ªMasked cyclopentenoneº-precursors 63 for versatile build<strong>in</strong>g blocks.<br />

(CO)5Cr<br />

H<br />

70<br />

+<br />

OEt<br />

Ar<br />

NMe 2<br />

SiMe 3<br />

EtO<br />

H<br />

ArH<br />

Ar<br />

Ar<br />

EtO<br />

+<br />

NMe2 H<br />

ArH<br />

Ar<br />

71 72<br />

Scheme 11.22 [3+2+2+2]Cycloaddition to spiro[4.4]nonatrienes.<br />

Ar<br />

NMe2

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