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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
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The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
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When understanding the effects of multiple forces acting on an object, vector addition is a crucial concept to grasp. This mathematical concept can be used to calculate the net force acting on an object when two or more forces are involved.
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Related Experiment Video

Updated: Feb 7, 2026

A Real-world What-Where-When Memory Test
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[Real-world data are an addition to randomised research].

Patrick M M Bossuyt1,2

  • 1AMC-UvA, afd. Klinische Epidemiologie, Biostatistiek en Bio-informatica, Amsterdam.

Nederlands Tijdschrift Voor Geneeskunde
|July 25, 2018
PubMed
Summary

Real-world data and evidence complement randomized trials by showing intervention effectiveness in routine clinical practice. Registries are crucial for understanding actual use and outcomes post-implementation.

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Area of Science:

  • Clinical research methodology
  • Health services research

Background:

  • Real-world data (RWD) and real-world evidence (RWE) are increasingly contrasted with traditional randomized trial (RCT) findings.
  • This contrast often overstates differences, as pragmatic RCTs also reflect real-world effectiveness in unselected populations.

Purpose of the Study:

  • To highlight the complementary role of RWD and RWE alongside RCTs.
  • To emphasize the need for robust data registries to assess interventions in clinical practice.

Main Methods:

  • Discussion of the methodologies and applications of real-world data.
  • Comparison of evidence from randomized trials and real-world data sources.
  • Emphasis on the value of registry data.

Main Results:

  • Pragmatic randomized trials can provide real-world effectiveness estimates.
  • A clear distinction between RWD/RWE and RCTs is often exaggerated.
  • Registries are essential for post-market surveillance and understanding actual outcomes.

Conclusions:

  • Real-world data and evidence are valuable complements to randomized trials.
  • Carefully constructed registries are needed to evaluate interventions in routine clinical practice.
  • Understanding actual use and outcomes requires data beyond traditional trials.