"Innovation Versus Diffusion: Determinants of Productivity Growth Among Japanese Firms"

This paper presents a model of firm-level productivity growth that distinguishes between innovation and technology diffusion, and then applies the model to a large-scale data set of Japanese manufacturing and non-manufacturing firms between 1994 and 2000. We find both innovation and diffusion are important factors in firm-level productivity growth. Results also suggest that innovation comes not only directly from R&D activities, but also indirectly from patent purchases and imports. Previously, patent purchases and imports were considered as sources of technology diffusion rather than innovation. In fact, we find patent purchases are more effective in this regard than R&D expenditure.

"Productivity Convergence at the Firm Level"

Productivity convergence among countries has been investigated extensively with mixed results. This paper extends the analysis to the firm level to shed light on the debate of convergence or non-convergence. We find productivity convergence among firms widely in Japan, in both manufacturing industries and non-manufacturing ones. We obtain these results taking explicit account of exiting firms as a source of selection biases. The convergence rate is much faster among firms than countries. We also find that there are substantial differences among industries in the convergence speed. IT industries that heavily rely on technological progress show faster rates of convergence.

"Does Natural Selection Mechanism Still Work in Severe Recessions? --]Examination of the Japanese Economy in the 1990s ---"

This paper investigates whether or not the natural selection mechanism (NSM) of economic Darwinism works in severe recessions. Although standard firm models imply the importance of NSM in an economy by showing firm's rational behavior on entry, surviv-ing, and exit leads to macro-level TFP growth, there is almost no evidence to demonstrate NSM works even in severe recessions and depressions. Based on micro data of the Basic Survey of Japanese Business Structure and Activities (BSJBSA) by Ministry of Economy, Trade and Industry, we construct a comprehensive firm-level panel dataset for Japan from 1994 to 1998, especially designed for the analysis of a firm's entry, survival, and exit and its relationship with TFP. Empirical results show that efficient firms in terms of TFP quit while inefficient ones survived in the banking-crisis period of 1996-1997. Besides, this phenomenon is mainly observed for new entrants and contributes substantially to a fall in macro TFP after 1996. These facts strongly suggest malfunctioning of NSM in severe recessions.

Estimating Effective Steric and Electronic Impacts of a Ferrocenyl Group in Organophosphines

A series of monodentate ferrocenylphosphines, Fc3P (1a), Fc2PhP (1b), and Fc2ArP (1c; Fc = ferrocenyl, Ar = 3,4-methylenedioxyphenyl), were prepared, and their electronic and steric properties were quantitatively determined. By the IR measurements of their respective Ni(CO)3(phosphine) complexes, the electronic properties of the ferrocenyl group in organophosphines were estimated to be similar to those of primary alkyl groups. The ferrocenyl group is a better electron donor than a methyl group and a poorer donor than an ethyl group. The gold(I) chloride complexes of 1a–c were prepared and their X-ray crystal structures were determined. The %Vbur parameters for 1a–c were calculated using the X-ray structural data, and their ″Tolman cone angles″ were estimated. The steric influence of the ferrocenyl group in organophosphines was clarified to be larger than those of cyclohexyl, tert-butyl, and o-tolyl groups and is comparable to that of a mesityl group

Copper-Catalyzed Regioselective Aminothiolation of Aromatic and Aliphatic Alkenes with N-Fluorobenzenesulfonimide and Thiols through Three-Component Radical Coupling

Copper-catalyzed regioselective aminothiolation of terminal and internal alkenes with N-fluorobenzenesulfonimide and thiols has been developed. The three-component reaction is promoted by the addition of dimethyl sulfide. In addition to aromatic alkenes, aliphatic alkenes are subjected to the reaction, affording various aminothiolation adducts as single regioisomers. The radical process is proposed by preliminary mechanistic studies, involving radical trap and radical clock experiments

Synthesis of Benzoisoselenazolone Derivatives by Nickel-Catalyzed Dehydrogenative Direct Selenation of C(sp2)-H Bonds with Elemental Selenium in Air

Nickel-catalyzed direct selenation of benzamides bearing an 8-quinolyl auxiliary with elemental selenium provides benzoisoselenazolones in good yield via carbon-selenium and nitrogen-selenium bond formation under aerobic conditions. In addition to aryl C-H bonds, the method can also be applied to alkenyl C-H bonds, constructing an isoselenazolone skeleton. Simple mechanistic analysis shows that the reaction proceeds through a rate-determining C-H bond cleavage. The obtained benzoisoselenazolones are transformed into various organoselenium compounds and utilized as the catalyst for bromolactonization of alkenoic acids

Atropisomeric Chiral Diiododienes (Z,Z)-2,3-Di(1-iodoalkylidene)tetralins : Synthesis, Enantiomeric Resolution, and Application in Asymmetric Catalysis

The C2-symmetric tetralin-fused 1,4-diiodo-1,3-butadiene derivatives, (Z,Z)-2,3-di(1-iodoalkylidene)tetralin 1a-c, are atropisomeric and can be resolved into the two persistent axially chiral enantiomers by HPLC on a chiral stationary phase. The enantiomerically pure compounds can serve as chiral organocatalysts for dearomatizing spirolactonization to show good performances in up to 73 % ee

Palladium-Catalyzed Regio- and Stereoselective Carbothiolation of Terminal Alkynes with Azolyl Sulfides

Palladium-catalyzed carbothiolation of terminal alkynes with azolyl sulfides affords various 2-(azolyl)alkenyl sulfides with perfect regio- and stereoselectivities. The present addition reaction proceeded through a direct cleavage of carbon-sulfur bonds in azolyl sulfides. The resulting adducts that are useful intermediates in organic synthesis are further transformed to multisubstituted olefins containing azolyl moieties

Productivity Convergence at the Firm Level : Effects of Exit on Firm-level Productivity Growth in Japan(<Featured Theme><LIA-CASSH Report 2008>Comparative Approaches in Social Sciences and Humanities : A French-Japanese Initiative via Joint International Laboratory between CNRS and University of Tokyo)

This paper investigates firm-level productivity growth with careful consideration on the effects of entry/exit. We found the productivity convergence among firms. Besides, the analysis without considering the effects of exits causes a statistically significant sample selection bias in the speed-of-convergence estimation.JEL Classification Code: D21(From Behavior); D24(Production; Capital and Total Factor Productivity; Capacity

Productivity Convergence at the Firm Level : Effects of Exit on Firm-level Productivity Growth in Japan(<Featured Theme><LIA-CASSH Report 2008>Comparative Approaches in Social Sciences and Humanities : A French-Japanese Initiative via Joint International Laboratory between CNRS and University of Tokyo)

This paper investigates firm-level productivity growth with careful consideration on the effects of entry/exit. We found the productivity convergence among firms. Besides, the analysis without considering the effects of exits causes a statistically significant sample selection bias in the speed-of-convergence estimation