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85020993599
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The preparation of a highly dispersed copper hydroxide supported on MgO was unsuccessful because MgO was somewhat soluble in the aqueous CuCI 2 solution
-
2 solution.
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45
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85021010302
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3 at 550°C.
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3 at 550°C.
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46
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85021002812
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In the 1,3-dipolar cycloaddition of 1 a to 2a, the reaction rate based on copper species (TOF) on Cu(OH)x/AI2O3 did not change with the loadings of copper species 0.5-2.0 wt
-
3 did not change with the loadings of copper species (0.5-2.0 wt %).
-
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48
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85020951792
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-
During the pretreatment, about 10% of the copper(11) species in Cu(OH)x/AI2O3 were reduced to copper(1) species and an almost equimolar amount of 2a with respect to reduced copper species was converted into 1,4-diphenyl-1,3-butadiyne. The degree of reduction of the copper(11) species increased with an increase in the pretreatment period, and all copper(11) species in Cu(OH)x/AI2O3 were reduced to copper(1) species by pretreatment with 2 a for 24 h. The reaction rate for the 1,3-dipolar cycloaddition of 1 a to 2a increased with an increase in the amount of in situ generated copper(1) species. All these results suggest that the copper(11) species in Cu(OH)x/AI2O3 can be reduced to copper(1) species by an alkyne according to Equation (1, 31] and that the in situ generated copper(1) species are true active species for the present 1,3-dipolar cycloaddition. Detailed mechanistic stu
-
[31] and that the in situ generated copper(1) species are true active species for the present 1,3-dipolar cycloaddition. Detailed mechanistic studies are in progress. equation (1)
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-
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49
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84945086317
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85021004490
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2).
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2).
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85021032848
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[14]
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[14]
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57
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85021014321
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The reaction shown in Equation (2) likely occurred on the copper hydroxide species. R'-D+Cu-OH →← Cu-R' + HDO →← R'-H + Cu-OD
-
The reaction shown in Equation (2) likely occurred on the copper hydroxide species. R'-D+Cu-OH →← Cu-R' + HDO →← R'-H + Cu-OD
-
-
-
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58
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85021003491
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It was confirmed that the observed catalysis was also truly heterogeneous for the syntheses of 3 g and 3 k
-
It was confirmed that the observed catalysis was also truly heterogeneous for the syntheses of 3 g and 3 k.
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59
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0000656358
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