The substitution of η⁵-Cp group with nitric oxide is the easiest for · ABC26IN1365
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: CSIR NET DEC 2012 · Marks: 2 · Difficulty: Easy
The substitution of $\eta^{5}-\mathrm{Cp}$ group with nitric oxide is the easiest for
(a)$\left(\eta^{5}-\mathrm{Cp}_{2}\right) \mathrm{Fe}$
(b)$\left(\eta^{5}-\mathrm{Cp}_{2}\right) \mathrm{CoCl}$
(c)$\left(\eta^{5}-\mathrm{Cp}_{2}\right) \mathrm{Ni}$
(d)$\left(\eta^{5}-\mathrm{Cp}_{2}\right) \mathrm{Co}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Nickelocene is a 20-electron complex; replacing a Cp (5 e) by NO (3 e) gives the 18-electron CpNi(NO), so substitution is easiest for Cp₂Ni.
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