Heterodinuclear zinc and magnesium catalysts for epoxide/CO₂ ring opening copolymerizations

Abstract

Correction for ‘Heterodinuclear zinc and magnesium catalysts for epoxide/CO₂ ring opening copolymerizations’ by Gemma Trott et al., Chem. Sci., 2019, DOI: ; 10.1039/c9sc00385a.

In the original manuscript, an error was made in Table 2 for entries 1–3. Incorrect TON and TOF values were reported for compounds 2b, 2c and 2e at a pressure of 1 bar. Also the PCHC selectivity values for 2b and 2c at 1 bar were incorrect. The correct TON, TOF and PCHC values for these compounds are shown below:

Table 2. Copolymerization reaction conditions ^a .

Cat.	Catalyst (mol%)	Temp. (°C)	Pressure (bar)	PCHC b (%)	TON b	TOF b (h–1)	M n [Đ] b
2b	0.1	120	1	>96	377	435	12 280 [1.04]
							5340 [1.13]
2c	0.1	120	1	>93	419	466	14 490 [1.06]
							5930 [1.15]
2e	0.1	120	1	>99	430	645	21 760 [1.04]
							9090 [1.15]
2c	0.01	120	20	>99	4415	8830	44 400 [1.04]
							21 200 [1.05]
2c	0.005	120	20	>99	5435	1359	54 380 [1.04]
							26 550 [1.04]

^aReactions were carried out in a Parr high pressure vessel with an impeller at 20 bar.

^bSee Table 1 and ESI for all data (Fig. S56–S60).

To highlight this update, the sentence in the original manuscript “For the Zn(ii)/Mg(ii) complexes, the best activity value reaches 654 h^–1 which is at the upper end of values for the low pressure regime.^10,14,15” on page 7 should now read “For the Zn(ii)/Mg(ii) complexes, the best activity value reaches 645 h^–1 which is at the upper end of values for the low pressure regime.^10,14,15”

Finally, a corrected version of Fig. 4 is also provided here to highlight the correct TOF value for complex 2e.

Fig. 4. Illustration of the structures, activity and selectivity for some of the highest performing catalysts reported for CO₂/CHO ROCOP.^{22,25,33,34,59,61}.

The original ESI was replaced by a correspondingly revised version on 16th May 2019 to reflect these changes.

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.